Go to the Formula 14 forum -- some people are talking about building their own. One thread with some good building information there is titled, "Want to help design the next F14?"

In the early days of the A-Class, a lot of people built Unicorns in their garages. The boat is 18 feet long. Sorry, but I can't remember anymore where to get the plans. I think plans for various boats may be available through Gougeon Bros. If not, they at least have a mountain of information available for how to build boats of all kinds. Their web site is www.gougeon.com. Give them a call if you don't see what you need at the site.