For some unknown reason, I saw these and had to have a set. I downloaded a set of plans but they were raster PDF and would not load into Fusion so I have gotten a good workout with this. First I put the PDF into Inkscape, did some tracing, imported that svg into Fusion 360, cleaned things up a lot, tweaked the length of the center pointer then imported it back into Inkscape to color code! So even though this started with someone else’s plans I still had to earn this.
EDIT: link to plans for those who see this but not that: