Trade shows, in particular boatbuilder trade shows, bring in many dealers. You need a rep who can believe in your product, and they are out there.
If you get together a good portfolio, video and photos, showing the construction plant, various stages of building, boat in water performing, test analysis, etc., he will have a better idea of how to market the boat, and he can use your material to sell dealers.
You will either have to ship a boat to a rep, or offer a money-back guarantee of satisfaction. Quite a risk, and costly, but if your boat is well built and at a good price, the risks go down.
Post a picture or two of your boats here, and get some feedback.