Hi, and welcome to paddleducks. Its nice to read a new face! I have my doubts about your model being that of the beautiful Marmion. She had a very long narrow hull- 210 foot long with a beam of only 24 feet across her hull giving her a ratio of nearly 9 to 1. Your hull has a much smaller ratio and is quite deep and has the looks of an early tug. Also Marmion had a near vertical knife edge bow where yours has a raked and curved bow. The stern is almost "spooned" and is rather full , again like a tug .I am pretty certain P N Thomas did an article on her. In model Bo ts magazine, I think in the ninetee seventies , with a detailed plan. If so it will be in paddleducks plans/articles section. Regards, Walter.