the rib seams don't appear separated
those long old cracks on the top could be a problem but really only if the top has sunk (lost it's curve) near the bridge feet - and I can't see any of that
rib cracks are usually not a problem in themselves but boy it looks like it was abused (what kind of music did great granddad play, Rockabilly? lol)
I have some very similar tuners/plates on a 1930s Voight & Geiger bass - they cleaned up quite nicely - brass with steel worms most probably
the neck looks okay (if not warped - can't tell) and I don't see any problems at the button or heel - can't tell anything about the fingerboard but that can be replaced if necessary
one long thin cleat inside the back seam and some side to side pressure could close the gap
i've done all these repairs myself very successfully without formal training - just lots of research, reading, studying & patience (+ tons of clamps)
good luck
oh, and also - pegbox cracks are usually repairable with a good gluejob even when slightly twisted