Hi Jim
Very easy to make, I call them blocks so all know what we are on about.
Little me was a seaman on amunition ships and landing craft for 6 years.
Right all I do is pick the shape and numberof holes for the "block".
Lets say the dead eye,
I take three small wires mount them in the right position for the holes and "block" size on a lump of ply wood. Then using paper not card (a good paper) cut loads of shape for the block. Then thread them on to the wires, the holes are made with the smallest needle I can find. Don't push it all the way through the paper, just brake the surface so you can push the wire in without bending it. Glue each layer as you go.
Compress it as much as you can without flattening it, leave it to almost dry and then run the needle round the outside to get the grove. leave to dry and while it's still on the wires paint it with a wood stain and leave to dry again and you now have a "block"
Takes a bit of time to get it right.
hope this came out right :?
Regards
Rob