It's not beyond repair. You can do it the ghetto way as people have explained earlier, or you can get a tube frame like the first response said. Doing it right requires getting it on a lift and having people check to see if your subframe has moved, what needs to be done, etc. You have to decide how much the car is worth to you. If it is a possibility to buy another cheap shell and swap your stuff over then do that.
I'm fixing my 96, I jumped a curb and my passenger side frame caved in. It's a perfect shell besides the front so I'm getting a tube front, I'm still shopping around for a decent shop
I think I failed to mention it will cost a shit ton of money. Always makes sense to start over if its a possibility. Once you get the motor out, everything else pretty much falls off.