Great improvement indeed ! And thank you for additional pics
I agree that doors could be bigger. Regarding height/depth, if it could provide you a rough estimate, accoprding to Wookiepedia U-Wing's height is 3,35m so around 2 minifigs and length 25m which is equivalent to 14-15 minifigs.
2 pics from the interior: https://boardgamegeek.com/camo/5e21303af920b2b25627b1c4fe524787b04fe30e/687474703a2f2f692e696d6775722e636f6d2f4f6d6f34784f632e706e67 https://boardgamegeek.com/camo/bda7a22191541e982311e32c99e38277666cb7d6/687474703a2f2f6e6572646973742e636f6d2f77702d636f6e74656e742f75706c6f6164732f323031362f30372f53706163652d4d6f6e6b65792d46656174757265642e6a7067
Note that both pics are from the "support" U-Wing, not from Cassian/Jyn's U-Wing, which has supplement seats.
Concerning engines, they could be indeed more ... bulky ? By the way, intakes of U-Wing's engines are like X-Wing's engines intake, but it's just a small detail.
Again: vey good job !