Aluminum wing, maybe back it with foam where your motors would mount?

My latest, trying to work with the 3.5mm extruded polystyrene from slingwing but it's thick, heavy and I suspect it will be brittle, also the Gorilla Glue that I have been using for other things, isn't sticking this foam together very well so I have to reinforce with tape. I'll try sanding before gluing.

Pic is of a small test aluminum wing from an aluminum can & a straw inside to fill out the airfoil, and the latest tri-platter wing thing. It glides well but fast (w/3 quarters). Probably too heavy to do what I want which is tight circling climbs and slow straight flight. May have to reduce scale. Needs lots more work.