Hi Ove,
I'm happy you like the hangar tool and thanks for your suggestions.
Different texture inside and outside is something which I've been thinking about, and it's already possible to use a different texture on internal walls of the hangar row, so it wouldn't take a lot of changes to implement it for all hangars.
It won't be a problem to reimplement an untextured floor as it's just a simple change to the code, although it may take a lot longer to implement untextured walls, beams, roofs, etc, so I would have to think of the best way to do it, but it's a definitely a good idea. The way it currently stands, let's say you select beams to not be textured, then this would apply to all beams. If you'd like just one beam to not be textured, I could implement this using the extensions field. Same for the wall, I could get it to leave the left wall untextured but texture all other walls using the extensions. If you want all walls to use one of your own textures, you can of course add them to the textures.och file.
I've actually never considered having single walls or roof in the hangars or the FPS impact of having double walls., and to be honest I haven't tried any of the hangars I've created in FSX, as I've been too preoccupied with developing the tool. It may involve a lot of coding to change it, but I will look into it.
Crossbeams in the walls is something I've thinking about as well (in addition to more details between beams, so it's something I will implement in the future. The detailed T-hangar has some crossbeams already.
In addition I'm planning to make the beam layout more flexible, especially with regards to the crossbeam layout.
Different textures and sizes for the crossbeams is a great idea. I hadn't considered allowing crossbeams to be textured differently, but that's something I'll implement soon.
It's currently possible to close the bi-fold and hydraulic swing doors by setting the door folding level to 90. I'm going to implement this for the sliding doors soon as well. The only reason why I haven't done so far is because as far as I know, it's not possible to animate doors created in SketchUp, so you wouldn't be able to use the hangar for parking, but then again, it's very unrealistic to have an airport full of open hangars.
This image is an example of the level of detail I would like the hangars to have, but it's always a battle to find the right balance between FPS and realism.
http://www.prizmamuhendislik.net/Images/proje/9.jpg
If you have any other suggestions, please let me know and I will add them to the wishlist for the hangar tool.