Dart Interior Differences 67-69

Sad to see this.
And you are probably right about suing him.
Chances are that if he did not have insurance, he probably doesn't have a pot to piss in anyway.
You will probably end up fixing it up yourselves on your own dime.

That being said, it doesn't look to be damaged that badly overall.
As 65Val said, I would start looking for a 4 door with a decent front clip and change the whole front clip out including the frame rails, inner fenders, and rad support.
If the frame isn't too bad, you might even be able to find a competent shop to pull it straight again.
Then there is the cost.
Perhaps it would be more cost effective to find a decent body and transfer the good parts onto it.

I would love to hear what @jimharvard would have to say about the legal end of it.