First of all, what's the brand?
The finish is in a pretty good shape considering the age of the guitar. Seems like the only crucial part that's missing is the jack. Is the pickup switch still there? I can't tell from the pics.
I'm not sure if the bridge is supposed to come off. When the guitar is strung, the strings will keep the bridge in place, but you'll still need to put it in the right place for the guitar to be in tune. The metal thing behind the bridge that holds the strings seems pretty rusty. You might want to replace it with a solid metal thing instead of a largely useless vibrato mechanism.
So looks to me that to get this guitar in a reasonable working condition you'll mainly need to have the electronics and the bridge assembly done (maybe replace the tuners?), clean it up, and have it set up properly. None of that should be very expensive. Sure, it might cost as much as a new guitar, but I'd pick a vintage guitar like that over an el cheapo Ibanez any day of the week.