How Do I Come Up With a Value For My Custom Car?
Aside from keeping ALL of your receipts, (ask a 3rd party to keep a copy too) here are some reputable resources:
The worlds premier luxury marketplace, you will enjoy this site for sure!
Lots of good links at this website, you can see what else is for sale that might be similar and it links you to some good places to find appraisers.
Exactly what it says it is, a place to buy classic cars. You can see auction results, look for parts, etc.