Hi Mike,
Here´s a video you may like!
This CJM F4 is from a friend of mine and we start to build it then he send to Miguel Alvarez, great professional builder and even a greater person, to finish it, we really did made so much, but i remember we did not put any carbon on the wings panel, or add any kind of spar reinforcement, nothing!
We just fiber glassed the wing panels and all the other surfaces with hobbico 3/4 oz fiberglass and some finishing resin, LOL
The airplane is flying with a jet cat P70
https://www.youtube.com/watch?v=d3BcI5dQ2xQ
Regards

Ricardo