I've constructed a Delta wing from the flitetest website.
I'm using it for my initial tests of the Drone computer systems. The airfoil itself cost me $10 to make of foam, and I can make a new one or quickly repair this one quite easily.
I'm interested to see which will get better flying first: The drone or myself!
I now have 2 drones. My Bixler, running an APM 2.5 board, and a custom foamie running a Pixhawk.
I am becoming a better drone pilot, and right now, autonomous landings are tricky, possibly due to large turning radius of the craft.
All said and done though, I count my efforts in this matter as successful.