Cool, very nice!
For the handles it's probably a good idea just to model them.
As for windows take a plane, copy it and rotate 180 degrees on the same axis so they match up on all sides.
I really don't know much about maya, but once you export it to BFmesh view, the end goal is to have an alpha texture for the windows (uv map them), then you can change to "alpha blend" in bfmesh view as well as save it.
However, this is all assumed if you are exporting this to BF2.