We just got him back!
Summation: His teeth were for shit. He did not have a broken jaw! It's just that the abscess was so awful that it shifted one of his fangs to the point where he couldn't close his mouth because it wouldn't line up.
So he needed teeth pulled, poor kitty. But that is all he needed. They ran a bunch of tests, so we have fingers crossed that there's no underlying horrible thing.
But the cost was actually, miraculously, only ~$500. So we have this covered with the donations we already have. No auction necessary, and I'm taking down the PayPal button. I'll write WTD with the prompts I currently have, but won't be taking more for now. We actually have $546 in PayPal, but we can put the excess toward his followup appointment.
Knock wood that he doesn't have anything horribly wrong besides that. But they seem to think this could be all. I won't really relax until we have the test results, of course! But there is reason for cautious optimism.
Thank you all so much for helping out in all the ways you helped out. More updatery when we get test results back.
EDIT: He is sitting in my closet - his Safe Place - all whoa, I am so stoned right now.