ok.. answering my own questions..
I guessing my main issue is that I didn't realize that each object in my mesh needs a corresponding physics object.
Massive issue as it's all separate objects which need to remain that way due to textures (all UVs mapped and I simply don't have the time on my deadline to re-do them all).
SO: new question. Is there a way for me to upload the multiple object barn, without doors, and have the uploader create physics that include a hole where the door is? If so, how do I do it?