I built and am flting a giant stinger with a magnum R5-400 5 cylinder radial for power
the only changes I made was to beef up the landing gear monut, the wing bolt mount and of course the firewall
I cut a groove in front of the spar for the extension wire with a "U" shape piece of 1/16 wire and heated itwith a torch
not a 3D bird as I've got mine set up ,,, but it soulds GREAT