Bud Nosen also made a .40 sized Aeronca Champion kit. One is for sale on Ebay as I write this at $49.99. The auction ends in 3 days, 16 hours. It has a 65 inch wing span.

I've asked this question before and it is really only a statement and has nothing to do with the Sig Cub or changing power: Why are there 15 ba-jillion J-3 Cub kits and ARFs offered on the market at any given time and so few (no) Aeronca Champs? I think the Champ was more popular (in full scale) then the Cub. At least when my Dad and I walked around airports when I was a kid, there were more Champs then Cubs.