I don't have a promaster yet, but the plan is to buy a 136in wheel base and convert to a basic camper. My wife doesn't want to buy a van without a pretty solid floorplan. I drew one up on paper but she wants to see something a little bit more finished than a drawing on a piece of paper. I'm new to sketchup so I'll be learning as I go, but I was wondering if anyone had an interior model of the 136in high roof for a starting point with accurate internal dimensions. Thanks!