Leigh walbutton is it?

No i didnt have to strengthen the airframe but I would advise full span webbing on the wings.. i have left every rib except 1 either side webbed. The YS 63 isnt really much more powerful (just more torquey!) than the irvine .53 or ASP .52 that ive used in the past so you dont need to worry too much. I use Futaba 3004s all round on mine, theres definately no need for more except perhaps for the rudder.

sure is a small world mate!