Yep, I will make a trip to the dollar store and buy up a bunch of "The Works" toilet bowl cleaner which will removed almost all the stains even lighten up bad rust stains. I may also spend some time removing all the vinyl graphics and stripping the bottom paint this weekend. I assume the best way to strip the bottom paint is with paint stripper correct?
Welcome aboard, looks like a good platform to work on. I'm guessing since you have a bunch of nicacore and coosa laying around that you have some idea of what you're in for? Looking forward to seeing your progress. Oh, and if you're using the gallery here for your pics, try clicking on the "linked image" instead of "linked thumb" and they will post full size.
Yeah, before flipping that baby over with a fuel tank in her (you drained it?) and maybe hydraulics, this should drive serious thinking. Also, how are you going to support it once flipped? Something to think about. You need support on the inside (think floor/stringers) and cap. I built inside frames that the boat was lowered onto (upside down) to support the hull/stringers for the bottom finish.
Sounds like you've got the boat building bug! You definitely have a good hull for doing what you want to do and it sounds like you have a lot of what you need already to make it great.