One thing that you have going for you is the "before" photos that may be helpful as far as your insurance company goes.If you have any documentation on the build,parts,and so forth it may be valuable for you to present it to them. A friend had a 66 Coronet stolen from a shopping center parking lot where he worked. The car was burnt beyond repair and the insurance company offered $1600.00. After showing pictures and receipts for all the work and parts, he ended up with over $10,000.00 No special insurance just your everyday stuff. It may be worth a try.