Guillo, the hingeless surface is built in the molds, can't really be added after market.

Another thing to keep in mind, once you open up the wing for mod work..........God only knows what you will find in there!! I've seen some pics of SM internals and they have no ribs. If this is truly the case and you cut open the Leading Edge, you will need to create a Leading Edge spar that truly conforms to the wing airfoli, else you may affect the flight qualitites.

I don't know man, the LE flaps would look super cool but IMHO, not worth the hassle.