Well it will be totaled because the tunnel is bent, I would buy it back from your insurance company and fix that sled, thats a simple fix. You could still ride it the rest of this year by simply taking out the bent rear exchanger, then using wood from the underside beat the tunnel back to a semi square shape again with a plastic deadblow hammer, its easy to hammer back into shape with the exchanger and tunnel end cap removed, the alum is soft and easy to bend back, the trick is to remove all the suports, i think theres 2 for the bumper also to remove, install a new rear heat exchanger and ride out the season.
Come summer, find a tunnel off one of the hundreds of vipers being parted out. Its not a awfull job to swap that out. The motor and stuff dont even have to be taken out to change the tunnel.