Ok, I have UV mapped the Barrack model. is the UV layout (I might still re-arrange stuff a bit).
One problem I am having is with hidden geometry. There a lot of hidden polygons in this model. For instance their a full-pillar inside the big tower geometry. While you can selectively hide/unhide sub-meshes within Max, this is not easy in blender. Since I am using the FBX file, there is no sense of sub-meshes. All I have is a bunch of triangles and I have to hide/show them one by one. Sometimes I miss some triangles. So I decided to UV map only the visible polygons in the final model. However I have tried my best of make sure polygons visible in sub-stages are also mapped - but I could have missed some
I will upload the latest .blend file soon