ok.. heres my current situation i've been thinking about building a bass for a while now, just for fun. My mom tells me today that she just scored a deal on a very large (i was told this by this by this, sounding like its 4" thick and plenty big enough for an entire bass or 2) piece of dried rosewood. The guy is apparently going to be bringing it over sometime. i'm thinking of building it as a 7 string. I've been wanting an ERB, and this may be the best way to do it, if indeed i do have a very large piece of wood. could i make the entire thing out of one piece of wood? I could also probably get some maple or black walnut or some other wood stringers from my uncle if need be. would the wood hold up to the tension or should i add a trussrod (or 2) or some reinforcing rods? any suggestions?