Thanks, Marcel. It's 56" wide, 48" tall and almost 8' long. The interior height is 40". My elevated floor is 54" wide by 78" long. The back footwell is around 15" long. I'm starting on the back wall/door, so I'm not sure how long it will actually be in the end.
I am running 13" wheels and have one jump down on size if I need to.
I am up for any

,

,

, or

from anybody on my design .