appraisal for a shitter?

A totally different post from our Fabulous Forums…
Hi all, for insurance and registration purposes I need to obtain an “appraisal” for a POS 20-something 1960s fiberglass sloop with no mast, no sails, no engine and needs a deck job – that I acquired for free.
I cannot use the lead “scrap value” for my purposes and I do not want to PAY a company to laugh at me and tell me that the boat is worthless…I’m not allowed to declare the boat worthless. I’d pay a nominal fee I suppose.
Any ideas on how I can get a legit appraisal value? I’d be happy to be able to demonstrate the boat being worth $100? $200? etc. Jump in.