The pin router is my own design, but it's fairly typical of an overhead pin system. I built the prototype about 25 years ago and it worked so well I didn't get around to building the final version until just a few years ago. But I used a bigger router in this one, a beefier lift, and a larger table.
The routing patterns shown are in .100 aluminum plate. My older patterns are in 1/8" tempered hardboard and my newer ones are in Lexan. I make a master pattern by hand and then use the same pattern router to cut out a small batch that are all the same.
That slab of aluminum flat bar brings back a flood of memories from my welding days. Mostly unpleasant.