Hey everybody, not much of a poster, but a plentiful reader as you guys have asked a lot of questions which my group and I have had, with wonderful answers.

Now I need to ask the questions, and may the force be with it.

SO! For the last 6 months or so, my players and I have been playing Star wars with a bit of a twist. Where Luke faces Vader and the emperor on DS2, Han and Leia on the ground, Everything goes wrong. Instead of the shield generator going down, Han's team fails, the assault on the DS2 ends in a debilitating defeat for the rebellion, and Luke, nor Vader have been heard of since. The Emperor controls all, and 14 years later(so 18 ABY) the Empire is imposing and everywhere, aiming to completely take control. Dark Troopers emerge and are a serious threat to any veteran, select group of 7 dark jedi(Under Palpatines control) work in the shadows to kill and convert other sensitives, Imperial check points and medical check ups(to insert trackers).

Our players are outer rim vagabonds, some that were of the few who survived the rebellion hunt. All in all, the story is bleak and oppressing, with the constant chance of being run down by the Empire.

However! Our players have made some friends and achieved a base in the Vegesso Asteroid field, planning to build an asteroid city interconnecting and using the materials they hollow out for future ideas.

I have come up with a system that calculated the amount of material that is available in the asteroids, the amount per day of mining for a single non stoping droid.
How Long it takes to build a room that would be of Personal & Planetary Scales

However, I'm trying to come up with a Vehicular/Ship building system based on the silhouettes and this is where I'm coming into some problems.

A) A Silhouette 9 Praetor Mark 2 class Battleship is roughly 4800-8000 meters, or 4.8-8km
B) The First Death Star Equatorial Trench was 503 Km in length, with the Second Death Star have about 2,827 Km in the length.
C) I believe in the EotE Core book, says the Death star is about a Silhouette 10
D) The Executor Super Star Destroyer sits about 19km in length.

I know that the Silhouettes are exponentially larger, so that means the example that the core book gave is no longer of use for this situations, requiring a new look at what sizes both the Executor and Death Star would consist of.

The main reason as to why all this is for my players. If they decided to start building a ship dock and building their own ships(as pretty much everything is the imperials or destroyed)

How much Material would it take to build the silhouette?
How long would it take?
If to build in a Dry dock, how big would it need to be to fit the size?

Anything you guys might question and think of that I haven't?

Looking forward to your replies, May the force be with you.

Well as the GM it's really just a matter of what will your players accept, and how will you implement it.

In some cases we can iron out some fine detail about the implementation of Sil that may help you:
Sil 10 is (probably) the Sil of the death star as a whole (the size of a small moon) and is likely the max intended Sil of anything (remember Sil is largely just about comparative results for determining difficulties, so once you hit 10 it really doesn't need to go higher). That said, the Sil of the Death Star is also limited in value, as the only time you'd likely use it is when firing the Superlaser. On the receiving end the Dstar is just so big, that if you tried to just target it as a whole (Sil 10) object, you'd also be looking at an armor rating of 10+ and so much HT and SST there would be no point unless you were also firing a Superlaser.
The rest of the time you'd break down the Dstar into sections relevant to the encounter in question (so Turbolaser towers would likely be considered Sil 4 or 5, as would specific hangers, comm towers, ect.)

Moving on to your actual questions....

How much Material would it take to build the silhouette?

It's not really a matter of Sil, as a matter of size scope and scale. Sil can be an indicator (ok, it's Sil 5, so I can start with Corvette-like numbers)but the actual materials involved would also need to factor in all the other items like weapons, support systems, special features and so on. A Sil 6 cruiser with 20 turbolasers is still going to require less materials, expertise, and other resources then a Sil 6 cruiser with 1 turbolaser and a cloaking device...

So short answer... GM's call.

How long would it take?

Also largely GM's call. Star Wars does like to pump out things pretty fast in many cases.

That said we've got a good idea that these big projects take years. The Death Star was shown under construction at the end of Ep III, and it only becomes fully operational in EP IV 20 years later. But then in EP VI we see the Dstar II doneish, with an operational superlaser... was it under construction at the same time as the DStar I? Did they start the day after Yavin? Was it easier/faster to produce the second time around? Who knows... only the GM. So just make a call and stick with it.

If to build in a Dry dock, how big would it need to be to fit the size?

Assuming it's essentially a hanger, at least 1 Sil larger then the vehicle being worked on. Some modification to this may be in order depending on how the drydock works, and what it's for. A skeletal frame rigged up to provide a thin atmosphere contained within a magnetic field might be a lower Sil. Likewise you could have a "moist" drydock shaped like a doughnut that would allow you to drydock sections of a ship, but not the whole thing at once.

You can also have oddball situations where the Sil stops mattering. A Sil 10 Death Star could house a Sil 10 Super Star Destroyer if it were built to do so, but that goes back to the first point about 10 being the max Sil in the game system, with things like the DStar being a bit beyond the scope of normal play.

Thank you very much for the input Ghost, some of those things I just hadn't considered and that helps a lot

The main reason is I feel that my players are going to try to build their own DStar or maybe something like the Darksaber super weapon, which led to these thoughts.

Thanks again, and as you said, I'ma hash out some numbers which make sense to me

If to build in a Dry dock, how big would it need to be to fit the size?

Anything you guys might question and think of that I haven't?

Looking forward to your replies, May the force be with you.

Technically ships would be built in a space dock, not a dry dock. Dry docks are for water ships to be built out of the water (or repaired out of the water). In the case of Star Wars, the construction yards would probably just be a skeletal framework system to provide anchors for the ship that is being built. The people would be in spacesuits until the sections of the ship could be sealed up.

How long does it take... That depends... How many people do they have available to do the work. How skilled are they. What condition are the materials coming to the yard as (fully assembled, just raw materials, etc...) can speed or hinder the ship itself. Star Destroyers are built at a record pace... but that is because there are quite a few ships in various states of construction at all times at places like the Kuat Drive Yards. So, while it might take 6 months to a year or more to build one ship, when you have 500 under construction, then about one ship or more a day should be leaving the yard for a shakedown cruise and heading off for its assigned station.

And at this point your players are playing Econ 101 dealing with all the paperwork and hiring people and finding suppliers and getting customers... and hoping that the Empire doesn't catch on to the presence of this new shipyard that might be buying up a bunch of weapons and/or raw materials for making armored plating...

I wouldn't base it on the size of the ships, but rather the costs. Look at a few of the ships/vehicles they would want to build and determine how long you think it should take to build one, divide the cost of ship by the number of days (or months) it takes to build, and that gives you your baseline.

Then just divide the cost of any ship by that number to know how long it would take.

Going by cost vs size is more balanced as a ship decked out with weapons and the best engines might be the same size a simple cargo ship, but would cost more and take longer to build than the cargoship.