David Politzer sent me these photos of banjos he's built from kits. (Musicmakers and Hughes Dulcimer) He said he had to make quite a few adjustments to make them turn out this nice--but aren't they lovely? I really love the one with the internal resonator and maple lamination (the rest and body are cherry) that goes the thickness of the neck . David writes that "somewhere in that sandwich they claim there's some steel, which should keep it straight in perpetuity."
Lo Gordon has been modifying the Saga kits and turning out some really wonderful sounding banjos with a metal internal resonator. He said he also has to make quite a few modifications to have them turn out so well. :)