According to Mike at Gator R/C and from what I can see the airframe is a mix of epoxy / airex foam and plywood. The plywood in our kit looks to be of good quality. Chris and I will post pictures of our build here and I would encourage others to do the same. Lots of great ideas out there that others could benefit from. One of the items we are currently playing with is how to set up the inner clam doors by using just the wheel / torque bar to aid in opening and closure. That's how it actually works in the full size and would eliminate the need for servo actuation.
D.W.