There's a few options but homemade vessels can be a pain in the Arse. At the Title offices' discretion you may need to provide picts or bring the boat up for their inspection to verify it is homemade. It clearly states it cannot be a prior built vessel that has been altered or modifed. Could be a tough deal. On the other hand boats made prior to 1972 did not require Hull ID #'s You could claim it is an untitled 1968 or ? and go that route. Worked for me last week on a Achilles Dingy
You can try to find orig owner or File a mechanics/ Storage lien and get the title that way, may take a few months but it is doable.