You don't have to tell me that, I know. The only reason these are 70 is that they are some left over stock from a factory somewhere so they are just selling them off. As for routing cavities the best thing to use is...a router...sure chisels can be used but it's far easier to use a router. Infact anyone thinking of making guitars should invest in one as it saves alot of time and gives great results...or you could borrow/rent one if the price is too steep.