Without reading over everything, id take the money and purchase back the car from the insurance company. I or family have done this with numerous vehicles in the past. Wont even show up as a ding on the title and you still have the car and money.
That bumper doesn't look as bad as mine when I had it repaired before. a decent body shop can do that for well under $1000. If the hood is crumpled, its trash, if only for safety reasons. Use this as an oportnity to upgrade(again, what I did). Norm's hoods are fantastic and you will never stop getting people asking you about the car after that upgrade. Tires are just tires, maybe $500 max? depending on what you run.
That rear panel will be the real problem. Ive looked before and they are hard to find. but there were just a couple front end collision redlines that are being parted out on ebay right now. may message seller and see if they have a panel. Its a red one, but paint will probably cost less than a repair. If the repair can even be done.
Headlights on ebay range from $250-300 each. but they are there to find. Same with Wheels, about the same price too. Or I know there were a couple members here that had some for sale.
If you have the time and means to do the work, id most definitely do it. I think it will come out cost positive.