Why not post some up to date pictures? Preferably some that show that you have now actually installed a headlight washer, a side badge and a rear plate.
I don't think you can ramp the price up due to the low mileage, when it was sat smahed up somewhere for four years.
I assumed that you replaced all the panels, but having re-read your thread, the damaged ones have been 'restored' with a hammer and polyfiller
If you were asking £7k or so I don't think people would have batted an eyelid, but at £12k your only going to interest of people that have not seen this site imo.