I am building a fully custom bass guitar and was wondering if my choice of wood will be sufficient. I have a neck made of maple, which shouldn't be too much of an issue, but I am low on money, and all I really have is some standard 2x6 boards. I am not sure what it is composed of, they are fairly heavy. I am making a through neck design, so the width is no issue, but would those boards be good enough for the body? I can buy better wood for it, but I really would rather not. Also, do I absolutely need a rounded fretboard, or could I have one that is flat and just sanded on the edges to round it into the neck?