I built this last year, and just came across the photos, and figured this was something worth sharing. I built a fairly standard DIY vacuum table, but kept the vacuum table free floating so registration could be adjusted if needed. The copper was cut on a metal shear and a large hole was drilled into it with a drill press that allows for the vacuum bed movement when loosened. The table was drilled with a hole just large enough for the bolt, with washers underneath and on top with a knob that is also from a standard hardware store. The ‘Target’ was drawn in Illustrator with 1/16” increments, and taped in place.