Jeff, I don't know of any books to read. Look at Youtube videos of stretch forming (aviation, airstream, and kirkham cobra manufacturing). The down side of building a hammerform is it's labor intensive and you have to store it somewhere (time to add on the shed problem). The positive side of it is repeatability, increase chance for a of making a usable part, and a way to start metal shaping (you have to start somewhere). I use a wooden mallet to start then a wooden slapper. Attend one of the metal shaping events and ask questions you may find many different ideas bondo bucks, wooden buck and FSPs. (see Dan shady for the slapper). Good luck. JPM
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