Thanks to the suggestions you folks gave me, I gave these folks a suggestion that has them all guardedly excited.
I recommended that they use a Grand Design Momentum 397TH as a basis for comparison Because it has two full baths, though the second is small. They are fairly excited about the idea of converting the garage and rear bath into a semi-private suite with its own outside entrance. Even thinking about taking two motorcycles along for the scenic rides and leaving the factory furniture in the garage.
They seem totally unconcerned about being in close quarters.
I will keep you all updated.