Judging from the cost of my car's
repair work when I was rear-ended recently, I'd say you have about $10K worth of work...easily.
Mine only involved repairing the rear quarters, trunk, bumper, etc. Your's has some front quarter, and side damage along with that.
Don't want to get your hopes up but I was SHOCKED when I found out the Ins. co. was going to pay to do the work. At the same time, I was ready to draw first blood if they had refused. Like you, I had a LOT of blood, sweat, and money tied up in the car....on top of what I had paid/over-paid for the car initially. If they had totalled the car, I would have ended up taking a MONSTEROUS personal and monetary loss.
The only/best advice I can give you is what others gave me; be PERSISTANT and demanding! You have nothing to lose by being a pain in the claim adjuster's arse when it comes to demanding full compensation (be it - having the car repaired or getting what you feel is a FAIR pay-off for your car).
Find good examples of other similar cars in comparable condition and keep a record of them to show the adjuster if they want to offer you some low ball figure.
Last thing is (wasn't logistically possible for me) buy back the car from the Ins. IF they total it. You would prolly be able to buy it back CHEAP and either use it as a parts car to sell or as a parts car for your replacement.
In any case, good luck, hope for the best, and keep us informed. A lot of what happens may be dictated by WHAT Ins. co you'll be dealing with. Just hope it's a reputable one.