As far as cad programs it is easy to use, other cad programs like catia, ug, pro e have more options but are harder and slower to use.
.....why arched Doors? I hope it will match the arched roof. The 30" dimension is on the roof not the crapper which is about 4'x 5'.
My design layout takes alot from different boat layouts, the bedroom is like a "cave" found in may boats, the same with the bathroom. It gives me more space for everything else. I have allways wonder why a $200,000 boat has a better interior than a $400,000 motor coach?
The electric toilet sounds good, I would like hear what you think about it after a few uses.