Hi slow/Mike,
If you aren't hung up on an all curved TD shape, consider this:
Check out forum member Maloney/Shane 's build. [He's from
Australia.] It's a just right sized larger TD I think. Its dimensions
are close to what you are discussing.
"My Mobile Man Cave"
viewtopic.php?f=50&t=47214Also, two doors are just plain handy. And a porta-potti would
be very useful, especially for the ladies and anyone who's getting
further on in their years [which includes everyone].
A small modification that would allow that, would be to build a
swing-out galley that'd swing out to be inline with the 'passenger
side'. The porta-potti would be housed in a cabinet positioned on
the driver's side under the counter level of the swing-out galley in
its travel position. Privacy curtains could be attached to the lift
up hatch and extend from the end of the driver's side TD body
and the end of the swing-out galley. This area would function as
a porta-potti enclosure and a privacy area for dressing/changing
clothes etc..
Here's a fast Paint drawn floorplan of it:

[Click on it to see an enlarged view of it.]
Run it past Angie and see what she thinks.
Just something to consider.
Cheers,
Norm/mezmo
If you have a house - you have a hobby.