I know this sounds silly but have you tried Google'ing with the words "vacuum bagging wing"? I did and turned up a whole whack of good looking links.

A buddy of mine made a HLG bagged wing a few years back and he used a single layer of 3/4 oz cloth with a tapered light unidirectional carbon spar under the skin. His spar only went to mid span but in your case it should go all the way to the tip to take the SAL loads better. And if you're making this a two or more piece wing then the joint had better be pretty skookum for obvious reasons...