Hello Robert, and hello again Gareth.
Gareth has given you the details of a fine, simple to use book, and I don’t hesitate to recommend it myself (even though I’m a member of the IGKT). I used this book to guide me in making side fenders, for a thames barge, and at Warwick in 2010 I was asked to make a large bow fender for an elderly gentleman, and there’s a picture of it attached. There are several fender types shown. The interesting thing is, with a hand tied fender, if you cut a string once complete it doesn’t fall apart like a knitted one would.
The book gives details for full size, but scaling down is no problem. Dependent on your scale, you’ll most likely find jute or hemp twine from a garden store to be of use, especially as its the right colour. Else source builders levelling line, the natural fibre one, and dye it before use.
Let me know how you get on, Kimosubby.