You should be able to knock out most of that. Buffing out the boat is mostly elbow grease. There are plenty of threads on here with lots of details. The rear seat can be done for not a lot of money as they were still pretty basic. Even cheaper if you can do the upholstery work your self. Spider cracks are can be done if you have some experience or are willing to learn as you go. Working with gelcoat isn't too tough. Sound to fit your budget might be a little basic, but you have options there. I might even know a guy who can get you a deal on wheels.
Two 14" 5 lug S5 wheels with ST205/75R14 Kenda Loadstar radials $349
Two 14" 5 lug S5 wheels with ST215/75R14 Kenda Loadstar radials $389
Two 15" 5 lug S5 wheels with ST205/75R15 Kenda Loadstar radials $409
Mounted, balanced and delivered.
PM or email me for tire, wheel or package pricing.
CARBURETOR REBUILDING - $199
Parts, labor and return shipping included
2 LED 6" BRAKE LIGHTS DELIVERED $32