In response to your questions, I'm fairly competent with wood work in general, but I've never attempted a guitar repair.
Some specific questions I would have:
- Is tightbond wood glue the glue to use?
- For the crack in the top, is a patch of wood underneath of the crack really needed, or would a careful glue job (and the brace that crosses underneath of it) be enough to hold it together?
- If I put a patch under the crack in the top, what type of wood, how thin, cross-grain?
- For the crack at the side and back, would it be worth putting a few gusset pieces in the corner to prevent it from re-opening?
I always thought it was a bit odd that there is almost no reenforcement at the joint of the back and sides of the Baby.