basswood is a good wood for a body
but
It may not be the best for a neck because of how soft it is
The neck would have a tendency to bend
of couse, because it is softer, it is easier to work with
It is cheaper because it is one of the softest hardwoods
read a book on woods your local library should have one
I bought a book full of hardwoods that says their woodworking qualities
hardness, price, toxity, power tools or hand saws, porous or non porous, stability
these are all things to pay attention to when buying wood for making a guitar