I have just bought one of these fine products - P Wessels was asking about an alternative way to mount the top wing - this is my attempt. Its made from 1.6 mm ply , the back bolt supports the rear of the wing and sets the incidence - the key slot locates the back of the wing and take the load when the model is picked up. I have to say that the original idea is hard to beat - this just gives the wing a bit more area to seat the wing.

Gwyn