Paul,
I'm a newbie and just found this thread. Wanted to commend you on your resiliance through the challenges. I wasn't able to read all 16 pages but wow what a spirit you've shown.
On the subject of the building have you considered a cut floor style service galley? It would allow access to the bottom of the truck without using a lift and you can put blocking in to close the floor when not in use.
I really like the idea of a tan floor. Wonder if I can convince the wife?
Regards,
Jimbob