Just guessing about OH, but I suspect if you wanted out of this contract, you could get out of it. You'd probably just have to ask the guy, and he'd let you out. Or go to court and they'd let you out. Either way, you'd legally have a right to get your money back. And that would be the end of it (the contract, that is, not getting your money). Getting a judgement for the return of funds is one thing, collecting is entirely another thing. Whatever money you gave him is gone, spent on himself or someone else's pool. There are no wages to garnish, no bank accounts to seize. These guys live check to check, robbing Peter to pay Paul. He couldn't return your money even if he wanted to (which he doesn't). Then there is the matter of the legal fees, and the inflated amount of the next guy's contract (which I assume is what you meant by $30K). All speculation, of course, but probably accurate.
Sorry, it kinda sounded to me like you wanted someone to state what you already know, to remind you of why you have to wait it out. If it helps: he's not dead, he hasn't said he won't build your pool. So technically, things could be worse. I'm not trying to downplay how bad things are, how unfair, merely that you made a couple of unfortunate mistakes, but so far they haven't actually cost you anything. (I wish I could say the same for some past financial decisions.) On the other hand, cancelling the contract definitely will cost you something, probably a lot. Two bad choices, but you do have choices.