I am a newish scratch builder and would like to know how I could join a
split main wing at the fuselage (low & high wing) for 40 to 60 sized
aircraft. The split main wing concept is necessitated due to transport
A wing tube, as Ted suggested, might be the answer. I'm building a Tower
Hobbies Uproar 60 and it has a wing 'center section' with an aluminum wing
tube going into the wing panels. The assembly manual is online. You might
look through it to see if you could make something similar work in your
design. Here's a direct link to the manual.