I'm also curious as to this response. Both the Extra and Cap from Midwest are excellent fliers in my opinion. I have build the Extra and also flown the CAP. Both planes were designed by Mike McConnville before he left Midwest to join Horizon. The one piece wing is a bit of a moving chore however with just a little work it could be modified into a wind tube arrangement. Probably come out even lighter. Photo of the one I did.