mmattokx, good link.

Nauset, I had built up balsa sheeting on 3 lite ply formers on my GP .60 and it was alright meaning it was light weight and not too flimsy. However, I will have a crack at mmattokx suggestion by trying to shape a foam piece into a turtel deck and then sheet it with balsa. If unsuccesfull shaping then I will ditch the foam idea and go for simple formers.