Hi Neil. Welcome to our group. I am assuming that your Lake Windermere is the one in the Lakes District of England. What a beautiful place it is. My wife and I have stayed at the Youth Hostel at Hawkeshead, and walked over the very same hills and looked over the same idyllic waterways of the Swallows and Amazons children in the Arthur Ransome books.
          As a child I read as many of these books as I could lay my hands on. I loved the shape and design of their cute lapstrake wooden boats. I think a seed was planted then. In retirement now I have re-read a couple of them. I suspect that my admiration of Iain Oughtred's designs had it's beginnings back then.
          What a place to build and finally sail a Eun Mara ! Good luck with your build. Keep in touch and we will help as we can.
          Here's a question I have been wondering about. Has anyone with a completed boat ever experienced any slop coming over the top of the outboard well ?
                                             Cheers, Bob.