I have looked at the different file format but none seem to be for Maya.

these are the programs I use

*Maya 8.5 Personal learning version
*Wings 3D
*Autocad 2008
*MoI.

I use to have MoI Beta but had to update :(

I really do not want to loose my designs as I enjoyed making them.
also I want to make them look cool by texturing them along with doing the plans view of them.