Refinishing that body would be a huge mistake. You can buy replacement parts, you can't buy an original finish.I can see both sides of the coin... I think I'd regret it if I refinished it especially for potential resale value even though many other components won't be original.
Pardon me for asking, but how much will the neck and body cost you? I ask because if the neck and body are going to cost you as much as a complete and original '77 Jazz, then it would make sense to stop where you are and buy an aftermarket body.

