You have time to wait?
I'm with moose as it doesn't really look like this one has had its cap off, between the soft hatches and scraggly rub-rail. But if the deck is solid, the hatches are something you can pop off and do quite easily with no prior glass experience and is a great way to learn about the joy of fiberglass. Then you'll really have the SeaCraft "itch".
If you want to get that fuel tank below deck its going to be a good bit of work and a new fuel tank. I don't think that boat has a coffin lid (fuel tank cover/cut out in deck) so you have to cut the deck up and lay it out. Plus (not sure here) but that boat might be a 4 stringer which complicates below deck tank a little more Sounds like for your purposes maybe you just create greater separation/insulation from the tank.
The thing you really might want to do is tap that transom all over with a mallet and listen for dead thumps vs hard crack. The dead thump is the soft spot. Do it all over the transom and a few times, you'll be able to echo map the inside of your transom by the 3rd time. If you have spots that you are unsure about, get a moisture meter and probe any spots, cracks or holes on the glass (provided the boat has been dry for a while) aside from that you can drill tiny holes in the glass and probe it where you think you need to. Moisture content should be no more than 20%. But if you are doing that, usually the check is already in the mail.
I say, check the transom, doesn't have to be perfect but make sure your not going to experience catastrophic failure anytime soon, clean it up, make it safe and running properly and use it for this coming summer before you commit to any big projects. You'll have time to prepare and a much better idea of what you really want/need to do and how to do it. She looks like a well laid out serviceable boat as is, enjoy her a bit.
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