Be careful with this. If the car is important to you I'd be very wary about making the claim. I tried to do what you are suggesting with my old Lotus Elan +2 - claim on insurance, then buy it back if it was a write-off. Trouble is the insurance company ignored my repeated requests to not scrap the car under any circumstances, (they'd taken the car away to assess the damage properly - or so they said.)
Turned out, they ignored me completely: scrapped the car, then tried to get away with offering me a tenth of the value. I wrote back saying I would complain to the insurance ombudsman and they finally offered me a decent amount for the car. No way though to get the car back, although apparently the agent dealing with my case was disciplined. My suspicion still is the car was "gifted" to someone along the insurance food chain, though I've no way to prove it.
If the car means a lot to you, ask them to do any assessment on your property, don't let it leave your sight until they have told you whether it will be written off or repaired.