Jim,
Yes, the laminated plywood is a good idea. I think that I had all the sheeting on before I realized my boo-boo. I appled some glass tape to the bottom of the wing to hold it together.
I am looking forward to flying this bird before the snow flies!
JC
ORIGINAL: Jim D
Somewhere in the old 'PB' forum I had a build thread for the first kit built (besides the prototypes). In it I noted this issue. Since mine was a 'first run' short kit I tried to use spruce hardwood for the lower joiner, no way to bend it enough. So I ended up making a laminated ply V-brace joiner.
You will enjoy the KatP. It is the best knife edging 40 size bird I've ever flown and does high alpha knife edge almost as easy as regular knife.