@SvenGeier
Way too thin. The guillotine relies on weight rather than a sharp blade. You want more like 1/4" out even 3/8" steel plate — target weight is over a hundred pounds. You're probably also going to want 8mm rope — it's easier on the hands. You may also want to beef up the frame some, given the forces involved — both when the blade drops, but also because you're gonna have a couple folks hauling on that rope to get the blade up, possibly at an angle. Some kind of cheat so you can tie it off safely while it's up is important too. Workplace safety is still a thing, even during the revolution.
@acb @badtux
@dymaxion @SvenGeier @acb I think 1/8th inch plate is enough for this. A 24x24 1/8" plate only weighs 20 pounds, but you can put a sixty pound sand bag on top of it and the rest of the apparatus for supporting the plate will be the remainder of the weight. The design for the DIY project is still a work in progress, obviously, but I'm sure it will evolve quickly once it gets tested the first few times.