@acb
It's 16-gauge, that's pretty heavy (2.5 pounds per square foot)
@badtux

@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