I had this plan to put perforated fake plates in a Crye mairitime JPC to make the holy grail of PC that actually wouldn't be very hot/sweaty in summer, so I bought some hollow plastic medium SAPI dummies aaaaages ago and through sheer fuckin laziness I never got around to doing what I wanted with them until this week. Tried just using a knife and mk1 hand first but being about 4mm thick and 'sticky' when cutting I could tell I was going to lose a finger if I proceeded, so I swapped to a holesaw + electric drill. End result has the solid edges/outline needed to fill out any PC and looks exactly like a proper plate when inserted, but it weighs almost nothing and has just enough rigidity in the middle to support everything.
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I'm already work on a connect-4 meme.