Flying RV/Camper

Bought an old Percival Sea Prince (twin engine with approximately
2,000 pounds useful with full fuel.

This might turn into an academic exercise only, but would really like
to save on car rental, hotel and restaurant costs when traveling. I've
already figured out the transportation portion with a scooter and side
car, but need thoughts on cabin heating, stove, fridge, shower, sink,
toilet, etc.

Anyone out there seen a converted beech 18, maybe a Grumman Widgeon,
or something similar in size?

Thanks
Bill