Dan,

The flex hinges on the BVM AFS kits are kevlar cloth sandwiched between the foam wing and the wood skin. Then they cut the foam and wood skin and "viola", you have a flex hinge similar to the ones on the composite wings like the Kingcat, or the Eurosport, etc. Its a pretty neat setup.

BVM kits do push the upper edge of the price envelope, but having gotten the privilege of flying, and now building them, I'm now saving up the $'s to buy one (MIG-15).

I've flown a T-33 on an AMT-180, which is about the power of the P-80, and its plenty. The P-70 should be good as well - its a bit less power, but also less weight, and easier to fit into the plane.

Bob