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i don't know why you would need so many textures layers though. 
I try to explain this.
We make our levels with models. But a complete room needs many textures for floor, wall, ceiling, columns and static details.
Until now I just copied all needed textures into one big texture. But then I have to map every floor tile since I cannot tile them over the uv-space. I have to create polygons for every floor tile, for every ceiling tile and so on. This results in much more polygons for a room.
We still can copy some textures into one. But the tilable textures should have their own texture space.
We would be very pleased, if you could direct us into the right direction. Thanks in advance!
Models, Textures and Games from Dexsoft
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