May I use these in my megamod?

I also want to suggest you change the mod to have the living quarters provide space for 250 personnel (5x) rather than only 225 (4.5x). You might be surprised just how much the larger size improves the space efficiency, but I counted some items between your small and large living quarters:

Right off the bat, the large has 42 bunks compared to the small's 8 bunks. That's 5.25x as many bunks. There are 15 storage lockers compared to the small's 3, that's 5x as many lockers. There are 8 cabinets downstairs, compared to only 1 cabinet in the small. If I am counting the computers correctly, there are 14 in the large but only 4 in the small. The small has 3 showers and 2 toilets, while the large has 10 showers, 4 toilets, and a bath. These computer and bath numbers are reasonable for the difference in personnel numbers, considering these items are community-used and will spend a lot of time not being used--so the small one is actually being wasteful with them due to its size.

Even the ground space alone is increased, not counting improvements in how efficiently it is used. The 1x1 facility has effectively 9x9 tiles, 81 per level. The 2x2 facility has 19x19, or 361. That's 4.46x as many tiles.

All of these numbers suggest not only could you house 5x as many people in 4x the space, but you can do it in considerably improved comfort. Rather than pack the people in like sardines, the large facility has a rec room, spacious walkways both upstairs and downstairs, officer's quarters, and it even has downstairs showers which can be used while a large number of personnel are sleeping.

I made an alternate large general stores.