When I built my first CNC router, I made a 'universal' 3-fin template alignment-thinggy that was 100%. . . meh. It was fairly accurate and somewhat functional, but quite fiddly, so somewhat pointless. The 'universal' aspect was that it could do tubes from about 1" to about 4" with fins that were exactly 3/16" in a 120 deg alignment, +/- probably about 0.010" at the fin tip, so decently accurate. Oh yeah, the max circumscribing circle, including the fin span was about 8". So it was completely 'universal' for what I was flying at the time and about 1% universal for what people on the forum do. . . maybe 0.5%. . .
When I bought my laser, I started making purpose built jigs for whatever configuration I was building at the time. Measure the tube, measure the fin, update the CAD file and run the part. They seem to be pretty darn accurate. Super easy to use and minimal set-up (as long as you ignore CAD time, laser time and all other non-recurring time wasted making one. . . ).
I think the initial intent of the jig was to do FAI competition models, I imagine it was 150% the right solution to that problem and imagine a bunch of winning models used it. I think the design is very cool.
I might buy a nice/precise version of the Art Rose Jig from brass, bronze, etc., in a steampunk feel just to support someone who tooled up to produce one. I wouldn't buy a 3D printed one most likely, as the art in this jig seems right in metal, but not plastic. The joy in using this jig (for me) would be to touch the metal, watch the function, measure with an indicator to prove it was just as good as it said it was and then. . . oh yeah, attach a fin. . .pretty similar to listening to vinyl with Class-A amplifiers. If it makes you happy, you'll be happy. If you're more of a high-res streaming with Class-D amp person, that's cool too, but the vinyl/class-a setup wouldn't make you happy. All good.
Sandy.