Hi Turrican,
I was never really making them ,
I made a couple, one set for me and another for someone else.
I just got a sheet of thin ali, Some tin snips, a file and cut it out to the template design above and then fabricated some cylinders from some tubing and some plastic screw covers and used a bit of plumbers epoxy putty to make the end caps fit on. Then used some thin rod and cut them to length for the middle pin bits. I simply stuck it all together with superglue. Done!