That's kind of my point. You don't see many 250+ kt let alone 350 kt homebuilts and the few that are out there are general retracts. However, you do see 200 kt homebuilts all the time to the point where the novelty of it has worn off. They aren't quite as reiterative as the various Cub copies but things seem to be rather stagnate at both "ends" of the homebuilt spectrum.
BTW, I had to google this Bonzo as I had never heard of it before. I never realized Wittman did much beyond the various taildragging bug smashers he came up with. Thank you for helping my respect for him grow a little bit more.