RE: Royal B17 kt
I friend of mine built one years ago and and the fuselage came out real light, but the wing.....
They way he built his wing came out real heavy and over built. I mentioned to him that he could build a foam wing faster and lighter than the built up wing. Use the balsa ribs for the foam wing pattern. Cut a foam wing, put a full height spar (1/8" plywood) at the 25% chord line from the bottom skin to top skin and run that 2" past the outboard engine. Skin the wing with 1/16 balsa and it will be lighter than the wing on the plans. No internal spar is needed past the engines, the wing skins provide plenty of structural strength. THen I would fiberglass the wing, mount the aileron servos in each panel, 1 servo per flap and 1 servo per engine, for a total of 8 serovos in the wing.
He used OS four stroke 26 engines, sounded great. THe cowls are real small so getting the tanks and engines in is a challenge.
Just my 2 cents of ideas on this one...
good luck
Fred Cronenwett