[ART] Map renders out pretty weird

[physcostealth]

So I decided on a making a huge model in maya for the entire map rather than making separate wall, roof and floor textures. It still needs a lot of work, but I wanted to export as a .dae just to see how it looked. In maya, it renders fine but the .dae is out of whack.

Here's what it looks like rendered in maya. I know, it still needs some work.

Spoiler below!

Here's what the .dae file looks like.

Spoiler below!

Wtf the bottom just like flattened out and the textures are all messed up

I must be doing something wrong with the textures or something but the question is... How can I fix it??