OK, so I've had some time to come up with a new sleeping arrangement for my camper. A 70" bed would have been a few inches shy of being comfortable. I did end up widening the camper 6", but only at the back, where the bed is. The sides of the camper will taper from 6' at the front, to 6'6" at the back. Visually, it's a pretty subtle taper but definitely would make a difference when it comes to sleeping in the camper. It will make the construction of the camper a little bit more difficult, but not too bad.
I had a chance to visit an RV dealer this past week and I got a lot of great info from the tiny trailers they had on display. Some of the models I explored were the TAB and TAG, Intech MaxFlyer, a Taxa Tiger Moth, a MyPod, and a little larger Park Liner. It was a very informative trip. The TAB was closest to my size and layout, although it was a little larger in all directions. It did have a 72" long bed, but it was laid out longitudinally, so it allowed your feet to hang of the edge. The interior was 70" at its tallest, but I didn't feel encroached upon by that height, I was afraid I might.
I made a new model to reflect on the widened design. The paint job is courtesy of my girlfriend. She said she'd help paint the full size one too.
Here is the revised shape, and the door on the correct side. I havn't finished building the interior in CAD but once I do I will get that uploaded.