What will you power your model with? Electric or gas? I'm wondering because with a 4-stroke you'll need to be using a recessed firewall, which will end up also affecting where you can place the "guts."

BTW, just for reference, the basic fuselage frame so far (with firewall, ply doublers, wire bracing, skid assembly and turtledeck) for my 1/6 scale DrI weighs about 250g. What's the weight so far on your fuse?