Eisentraut used to offer a class I think it was totally dependant on the skills the students arrived with. I saw a couple of horrible frames .I think you have to have the proper skills before venturing into it. I think Doug Fattic currently does similar classes and maybe he will chime in BOB FREITAS SUNNY MILL VALLEY, CA USA
Today at the Mill Valley Swap Brian Blum scored an Alex Singer with rack etc for $500 ,way to go Brian