I thought I would post an early WIP picture of one of the sculpts I have been working on. Although I did not include anything for scale reference in this pic, the ditance from it's collar bones to it's groin is 5" long.
I use aluminum wire for the armature of the dragon, and for the wing membrane I use aluminum wire form (wire mesh). 1/8" pattern works best for me (the pattern count is higher, smaller holes in the mesh). I cut the mesh to the size of the wing armature, then use a hot glue gun to attach it to the armature.