I liked the original model but 20mm aluminum wasn't as readily available as some 5/8" so I made a—far cruder and less skillful—simulacrum of the original that met my dimensional needs.
The hole size is based on the physical rods I had—which measured in a bit big—so I'll attach the fusion files for anyone that wants to tweak the sketch for their size. These fit perfect—will add a finished photo when I finish my drybox and put it in.
The author remixed this model.