My wife plays the cello and recently we went to a violin maker for a tuneup. I asked him if the wood used in the instruments was steam bent, but he said that it wasn't. He said that the hardest thing about making the instruments was planing down the wood to 1.5mm thick (I think this was the wood for the sides). 7mm sounds waaay too thick for the sides of a guitar. Even the top would only be about 3-5mm thick?
"If something is really worth doing, it is worth doing badly." - GK Chesterton