It's time to get back to work in the real world. Here is a Mosrite body, almost completely recovered from its brush with water-based polyurethane. Stick with oil-based, water-based is junk.
This one went through a long and torturous build process over almost two years. All I can say is don't believe the "advice" you find on talk_ass. However, in the end, it turned out to be a pretty nice instrument.
I have several of these necks and bodies roughed-out, and they feel much better than my first one, much better balanced. I knew that banjo neck would never play well, which is why I used a standard Fender profile on my first one. Banjos are made for picking. Intonation is one of those things where close is good enough, and with only 16 frets, I doubt it will ever be a problem. You'll be forever wiping smudges off that copper pickguard. I would shine it up and clear-coat it. Make a brass headstock tag and print out a waterslide decal to put on it. I posted the graphic above.