go ahead and make one -there are lots of examples --a biplane is actually a joined wing
some have two V shaped panels
as long as you figure out the aprox cg (cut a paper planform of the finished setup and balance by picking op with a straight pin)
make it very light - this resolves lots of problems for you
the easiest ,best approach is to obtain some 3 or 6 mm Depron and simply make a simple one from the sheets and power with a small electric setup - easy to fix and modify - then if the mood really strikes you-- do it all larger with a built up model .