I guess my immediate advice is;
1) Get to the hospital and have Sean & Lane thoroughly checked-out by the hospital.
2) Obtain a copy of the Police Report which should establish fault and the other party's Insurance Co. info.
3) Get in touch with Fred Carlton in Georgetown, --or Ross Lilliker in College Station to start learning of options available from local shops/hobbyists.
4) Contact the other party's Ins. Company to determine how they want to proceed. Knowing #3 allows them to know the options too.
5) Let the Ins. Co Adjuster make the next move on how they want to proceed.
6) Explore the options on how Sean & Lane want to proceed, ...and then ask for help here.
Personally, I feel the car is hurt severely and it appears the damages are greater than the market value. With that said, I suspect it could be band-aided up with some outside help from locals and some perseverance where it could complete the trip, ...albeit crippled. Maybe someone knows of a replacement Coupe for sale in the area that Sean could purchase and be on his way??