Don't mess with the finish, just a good buffing. Those checks are typical of the late-70's Alembic finish. Some of us even like it.
Frets, and setup, and have someone check out the electronics thoroughly. You should be able to check both pickups and the switching with a set of stereo headphones, but have someone thoroughly check those Series electronics out, especially since they've been sitting idle for a long time. I see some corrosion creeping out of the screw holes on the backplate where the preamp card is mounted, and maybe the trimpots too. (like maybe some batteries leaked out...) You definitely need to get that cleaned up but do not spray anything in there to clean these parts.
These are issues that are probably resolved locally without too much expense. Selling an Alembic bass with issues means taking a $$$ hit, and it'll come down to how much you're willing to give up. Here's the downside- after you get that dragon properly set up, I'm betting you ain't gonna' want to sell it anymore.