Greetings,
I am in a similar position - interested in the Outer Banks 20.
Although there is interest, I know of only one built. But this does not scare me off so much. I had some questions and was able to call the designer (Graham) directly and he was very informative.
I am building a small day sailor now, the Skerry by Chesapeake Light Craft. A much simpler boat but plans were $90 and these were not full size. Glen-L has similar pricing. With B&B I like that it is not only the plans, you get phone access to the designer. In a pinch, I think that is going to be a big help.
I also have been searching the web, and got a few books on the cold molding process. These plans use the "ashcroft" method which is a bit simpler, but I still wish to read up on them
Hope this helps somewhat. Good luck with your choice and build.
John