(No-one seems to be using this part of the board so I thought I'd 'give it some air'.)
This design should get absolutely everyone's backs up! It's square, it's certainly not a teardrop, it may not even be tiny, you can stand up in it, it's got the galley inside and it's not very simple.
However it's a (sorta) copy of what I do think is an interesting design - the Compact Jr and/or Compact II, moulded in fiberglass in the 1970s. Pretty much the minimum size trailer with 2 berths and standing headroom.
My version is redesigned for one-off building in plywood and the plans are here.
Andrew