Yeah. I was getting geared up to cut my own out of carbon fiber but getting ready to dread it. But also lucky for me I saw these too at the toledo show and bought them.

I made a composite main spar. It utilizes the phenolic "cardboard" tube in which the aluminum wing tip tubes mounts in "sockets" and vacuumed bagged w/ epoxy resin a carbon braid sleeve. I've also added a balsa plug "a stop" for the al. tube. The entire assembly is glued into the wing sections using the al. tube and cradles and weights to keep things aligned, straight and true. Of coarse ply shim spacers where added between the tip panels so they don't accidentally get glued to the main wing. The glue I used is pro bond polyurethane expandable glue. Also I drilled a small hole through the main spar to wick thin ca to glue the balsa stops in place.
Gunny