Roll on! Like most people, I like seeing and reading about other's camper ideas, even if they're not yet ready for launch.
The idea of keeping the roof height low will naturally help off road clearance and CG, and will certainly keep things lighter and less complex (less costly as well) - all good things. This is how my Mog is currently set up. This may work out well for you but after living with this arrangement for several years, I think I want to be able to stand properly in the camper. The Quasimodo deal gets old after a few weeks on the road. If you'll spend most of your time in warmer weather, you could also build a large roof hatch. Still simple and light.
My plan was to build a new camper with an articulating roof but I've decided to build down instead of up. I believe I can build a trough into the floor that will provide at least 6' of headroom with a very minimal increase to my current overall outside height. The trough will drop into the empty space between the torsion-free mounts and should add ~8" of interior height. With the front and sides of the roof tapered (smaller but similar to Mog ambulance boxes), off road capability should be maintained. It will be far less complex and without the added bulk up high (from the moving roof), the CG may even slightly improve.