Do wings on a plane need to be in the same plane horizontally, or can one wing root be 6" lower than the other?
The left and right wing may be at different heights.  You'd suffer from interference drag at the joint between them, or extra induced drag from the two extra "wingtips" if there is no joint, but a slow ultralight can tolerate such drag better than most airplanes.  This may be the only asymmetrical design that Rutan didn't attempt.