RE: Foam wing Lay Up
Dave,
Brian Buaas did a bagged carbon over blue foam Q500 wing for me, that I used at the 2002 NATS (well, for two rounds). It came out heavy (20 ounces with servo), but the fuse was light enough that the plane was less than 2oz over weight.
The problem with bagged Q500 wings is that in order to make them light enough, you need to be extremely careful, as they dent very easy. I wouldn't even think about trying one with white foam. The blue foam/carbon wing I had was marginal as far as ding resistence. If the wing was layed up lighter, or had lighter/softer foam, it would have been even worse.
Q40 wings are better suited to this technique as there is a lot more weight margin to work with, plus the wings have a lot less area.
GS