I'm a bit confused by Table 1-6 in Battlefleet Koronus. With craftsmanship adding to component SP cost and thus giving you a larger penalty to the aquisition by reducing it's availability, does this mean it doesn't give the usual penalty for improved craftsmanship or does it penalize the Aquisition twice?

Example: Best Craftsmanship Sunsea Laser Battery is a 3 sp component, does this give it a

a) -50 Aquisition modifier (-20 for Very Rare from being 3 SP and -30 for being a weapon component)

or

b) -80 Aquisition modifier (-20 for Very Rare from being 3 SP and -30 for being a weapon component and -30 for being Best Craftsmanship)

Both are IMO problematic as a) results in there being no difference between Best Craftsmanship or Common Craftsmanship when aquisitioning a 1 or 2 SP Archeotech component, while b) makes aquiring Best Craftsmanship anything more or less impossible as it gives a -50 to the Aquisition.

Mostly I'm confused as to why table 1-6 was needed at all, it would have been much easier to just check the availability for the component with common craftsmanship and then add the usual craftsmanship modifier to that like it says you should do in the core book (which would in this example result in a -60 modifier).

Looking over the section in BFK, I'd say (a). The craftsmanship is already included in the SP cost as per Table 1-4. And the book clearly states that Archaotech components are always extremely rare unless the SP cost would be higher otherwise (bottom of p18). So yes, there isn't any difference in cost for a 1 SP and 2 SP archaotech component past ship creation.

The increase to component cost is simply when building the ship.

If you want to get a component as not common quality later on, you take the normal rarity, then modify based upon standard quality.

So b) -80 Aquisition modifier (-20 for Very Rare from being 3 SP and -30 for being a weapon component and -30 for being Best Craftsmanship)
or 5SP when you're building the ship.

Your archaeotech components whether 1 or 2 SP would have the same base difficulty of acquisition (extremely rare, by memory?), but then this would be modified by quality of the component (+10 for poor to -30) and any other modifiers (-30 for weapon component).

So a best quality archaeotech weapon component would be Extremely Rare (-30), Weapon Component (-30), Best Quality (-30) for total -90.

Ah I missed the "at ship creation" bit. Duly noted.