A few points from an old geezer who has been on earth a long time.
You are in the right 100%. Luthier lost my sympathy at non disclosure. I'm concerned this is going to eat at you far beyond any partial resolution will. And it will, by the very nature of being something that can't be undone, be a partial resolution.
So you go before a judge who has no knowledge of guitars, wood or any other knowledge of how things might be broken. Could it have been dropped in the parking lot on the way home? We know that isn't likely. Wouldn't it be likely something so obvious would be noticed immediately in an area that was the subject of repair? Are you going to tell the judge about the drying properties of laquer? So a judge is going to find some middle ground and say, tell the guy to pay you $500. In my state, that is a judgement in your favor. Cash is not forked over to you. You then get to go to the sheriff with the order to be enforced. Where do you think this is going to be in their order of importance in the grand scheme of things? So you end up being, and rightly so, pissed off at the whole bunch, and out to get your due by spreading negativity hoping to get some bit of satisfaction because you are in the right. Know what? You never will.
Ask me how I know this. Like I said, I've been around the block a few times.
So what would I advise? Communicate if you can. Tell him your previous communications were harsh because you were upset, and you believe rightfully so, and you don't want to feel bad and don't think he does either, so realizing what is done can not be undone, what can he do? Maybe send the guitar to a finish expert? There are guys that can make that visually go away.
As to the whole monetary loss aspect. Whatever your circumstance, money and possessions pale in importance compared to the health of you and your loved ones, or simple peace of mind. I am not a religious man, but I do believe in the power of forgiveness.
So do what you want, for I probably would have too. I believe in the school of hard knocks too.