As promised, a couple of photos of the completed fishnet.
It ended up much longer than expected.
The whole net ended up about 16' long. I would like to have made it wider, but to be honest, I was really getting restless and needed to complete other work. I ended around 2 1/2'.
I wanted to try making the fishnet in the manner of the pictures in Diderot and others. I have found some very much simpler instructions, but not documentation that anyone "did it that way".
So . . . after much mindless monotony, a fishnet made with period hemp material is born. The "diamonds" are about an 1 1/2 to 2" on a side.