A bit of tinkering suggested I needed a way to repeatably position stock sheets on the honeycomb, so I conjured stops that would be slightly taller than the magnetic spikes:
Three of those form a corner into which you can tuck victims of the same general size:
Those pointy MDF spikes should start with slightly rounded tops, because that’s what they’ll look like after a few uses:
I also made a low-profile stop for victims lying directly on the honeycomb for engraving:
The SVG images include a nested version to tile across random MDF leftovers.
The SVG images as a GitHub Gist: