Considering that we see Po & Fin in a FO FO there is enough room for a Pilot to stand in that cute little tower and zoom this thing around!
First Order Large Ship Options... I like Micro Machines!
There's supposed to be a pilot in that tower, remember?
And that tower is massively smaller than a TIE/fo, which is a single-pilot ship, so not all that large. Compare the landers tower with the size of the "eyeball" of the TIE and you either have a lander that's too small, or a surprisingly roomy TIE/fo with space to have a nice lounger and tv-set in the back...
It was discovered a few years ago that standard TIES are pretty roomy - the "cramped TIE" diagrams were based on a 6.3m length - but when they went back to the props, it ended up being 8.99m - which is why the Databank now uses that figure:
https://www.fantasyflightgames.com/en/news/2012/7/16/the-making-of-x-wing-tm/
http://www.starwars.com/databank/tie-fighter
If you measure the TIE panel front to back, and then feed in the 1/270 scale, you get approximately 9m.
That's why Rebels TIEs look so roomy - they're based on that figure - with the side panels scaled down a bit to look more McQuarrie-ish, but with the ball cockpit remaining the same size.
As for the TIE/fo - they're pretty small: apparently they're 6.69m long (Incredible Cross Sections: The Force Awakens):
http://starwars.wikia.com/wiki/TIE/fo_space_superiority_fighter
but the models in this game look only fractionally smaller than standard TIEs. Maybe it's a compromise - in order to avoid them being dwarfed by standard TIEs?
Well, there's "more roomy than originally thought" and then there's "roomy enough to host a toga party for 20".
I still say they're too small (the landers) based on the comparison to the TIE.
Remember, the pictures you're showing from the movie are of ships in the sky that are at different ranges from the camera, so judging size in comparison to eachother there, is doomed to fail.
Instead, look at the cutaway that Joe Boss Red Seven posted above.
Comparing that to the model and the TIE model, I'd say you could fit at least 7-8 people in the TIE's pod.
That's a bit too much, even for a "big" TIE.
Here's a TIE Fighter cutaway... I don't see 7-8 people fitting in that pod. (and since the pilot is shown to scale there, you can easily compare it to the Lander cutaway and see that the model should be bigger)
