How do you plan to fold the wings without a center section? How would disconnecting the split wing pivot bearing be simpler than the standard flea wing fold. Why would making the front wing fixed and putting elevons on the rear wing be better? The idea behind the Piojo is a simple 3 axis flea. I think the best way to approach that is to just make a standard 2 axis flea and give it ailerons. The simplest and safest way to do that is to put them on the rear wing.