Wood
Sig Sukhoi would work great with a 40cc gasser. Its wingspan is right around 77 inches. The Sukhoi's have a little wider chord line than most other aerobatic designs out there, so you end up with a smaller wingspan if you keep the total wing area the same as an extra or an edge.
I have the Sig Sukhoi flying on a FPE 3.2 gasser and it flies great. Ulimited vertical and will still land very slow. Total weight is right around 13-14 pounds, but I haven't weighed it in a while. I don't know of many kits for a sukhoi in this size range. You may be able to find a set of plans and build one from those. Good luck with whatever you decide.