i went to one of the local bookstored here today to pick up some reading material for class and i went back into the arts supply section and found there balsa selection ( for arch and building science majors mostly). I looked through it and found that not only did they have a pretty good selection of balsa and basswood, they also had cherry, oak, and a few other hardwoods in sheets of varing thickness. I dont know if this has any relavance to plane contsruction, in fact, it probably has little to do considering balsa is used because of its wonderful strength to weight ratio. but i guess it might be interesting if your not worried about weight to sheet a plane in 1/16 or 1/32 hardwood sheets. would give it an interesting look.
edit.. made some progress on the mustang.. i went in and cut the barn doors off. i tried to use ca debonder to get the hinges out.. didnt work at all, so i just cut em. will make the smaller ones soon and attach them.