Sterling and Guillows both make Tri0Pacers... about the same size... under 30 inch span and rubber powered. (obviously not what's wanted..)

You'd be amazed at the kit-bashes that have been done based onthe Kadet Sr and Seniorita... Practically anything with a flat bottom airfoil and non-tapered wing, plus some with some taper in outer panels, such as a Cessna-337 (Skymaster).

I'll have to look up the website which has a LONG listing of Kadet bashes... and includes a lot of pictures and drawings of how the bashes were done. (most took very little change to achieve the desired look.)