So I'm not an engineer or anything special really, and quite a bit of what's said I'm not sure I understand, but I'm just thinking of one minor point people have been overlooking.

Everyone's focused on how this thing would fly. I'd seriously consider first.... how this plane can even roll around on the ground. Supposing a large wingspan, if the wings are perpendicular to each other, that fuselage will be really high off the ground. So that you'd need to either put the main gear on the bottom wings, or have them incredibly long to have the wings clear the ground!!!