First off Bones, make the mesh watertight, so you have more space on the map for what you really need it for, and before you even slap an UV Unwrap onto it, kick a reset X-Form modifier onto it (on the right panel Tools tab> Reset X-Form) so everything aligns correctly on map projection. ;) after that, use an automap only as the first step and then set everything up manually so the sizes of the pieces are consistent and uniform and that they use up as much of the map as possible.