I'm glad to see there's so much interest for a kit. Anyway, first things first: for now, my goal is to produce a model that flies well, makes weight, it's cheap and not that hard to assemble.
Papaone, i always had foam core wings in mind, but your idea makes perfect sense I'd like to try a few things though (swept wings, anhedral stabs, etc.) before deciding about the final design. Congratulations for your design, Harmonie is an awesome plane.