What I think you need to do, the first thing, is to move the car back to your property. Even if you have to pay to have it towed, get it back there, if it isn't there now. This "puts the ball on your side of the court" so to speak. This puts you in possession of the car which is to your advantage. They will want to come look at it, but the downside is they will take their sweet time, when the car is on your back 40, 10 miles up rural route 5.
I've known people who were able to extract a simple settlement out of the insurance company without the formality of totaling the car and buying it back, I'm not sure of the exact details, but in both cases it helped I think that the owner was in possession of the car, and the insurance people didn't have to deal with it, just wrote a check. It will probably take some wrangling to get what you want, as far as value, and I think anything you can come up with to corroborate the value or condition can't hurt, such as receipts for items you installed, photos, mentions of your car on any internet sites, offers in writing that you may have had, or evidence of other cars being sold at a value you think it's worth.
I'm not sure where your insurance company gets involved, other than possibly acting as an intermediary or if their insurance coverage was inadequate. And, if you need to talk to a lawyer, you should at least be able to ask some general questions about your case, and whether they can help you, without having to pony up any money.