I have no doubt that there are techs who can repair it (you being one of them), but I would be stunned if either insurance company didn't total it.

My $.02? Go through his own insurance company, take the total loss settlement, let the car go, buy another one, or buy something different, or put it in the bank. Between the reduction in the settlement amount for keeping the car, plus the cost of parts/labor/materials to fix it, I can't see how he would come out ahead. Let someone else buy it at the salvage auction and part it or fix it.