I don't know for sure, but I'll bet the Phaeton has two wings for the purposes of generating enough lift to fly it comfortably. You might take the extra ribs not used on the top wing and extend the lower one. Then you have to figure out how to splice on to your spars, leading and
trailing edges. But why would you want to? Get what you want...and if what you want is a
Spacewalker, then get it!
David