Hi I'm busy building a Billings Smit Nederland. I bought the kit from the daughter of a gent that has passed away. It's an old model, pre the days when the wood was laser cut. He had started to cut the parts out, but unfortunately they were badly done which has meant a lot of remaking parts. I have just completed the fenders and did them as you have.
Please could you let me know what you used around the rails of the hull. You have painted yours black.
I have a PDF copy of the instructions if you would like one as well as a web link to the 3d design of the Nederland which gives a lot of detail.