I am working with State Farm, even at the trememdous cost of parts, they are pretty sure my car is a fixer versus total because the damage on the rear appears limited to 1/4 panel, deck lid, bumper and trunk floor...Of course there will be other smaller items, bracketry, etc...
State Farm Service First repair shops can pull up a "low blue" like value of the car (from Ins co, no idea how they come up with this number) and they will pay ~ 75 to 80% of that value in repairs...Anything over 80% they will total it out.
Also, Insurance company won't allow the repair shops to use "used" parts...Seems like for Vipers they should modify their policy, they could save a bundle...
Tomer