I also replaced the balsa sheer webbing at the wing root with two plywood sheer webs per side. Since the carbon tubes for the wing rod get epoxied to these two sheer webs, I just felt these should be stronger then balsa. I toyed for a long time with making deeper modifications to this area of the construction of the wing; but, in the end thought Dynaflite has been successful with the Butterfly as designed, so go with as designed but in favor of changing these sheerwebs to plywood in this location.

I don't care for a few things about this kit. I don't think the design is as well thought out as it should be. The wood is great, the instructions are fairly good, other then as previously mentioned. It doesn't compare to their SE5a which I am also building at the same time.