Dietrich, I like your solution to this problem. I have been considering the same on my TC800.I hate the portages poddy I have now. Too short. What did you do for a top piece on the commode?
The Thetford was just the right height to fit in the dinette cabinet next to the door once the cabinet door had been modified. The original cabinet top panel is now used to cover the Thetford Curve and make the dinette back to the way it came from the factory. I simply added a spacer to where it was needed.