"Master of the Flying Guillotine" was a series of cult-classic movies, there's a handful of them. Poorly dubbed, overly made. Pretty much everything you'd expect from those types of movies. Probably the most popular one is about a blind assassin who uses the titular device to avenge his (son's?) murder.
Tori's design lineage was probably "closest" to device used in the movie(s), though I think it's implied/partly seen that the device uses a series of knives that sweep in to do the cutting, sort of what it looked like their earlier devices were going for and what Grant's final device was (without the outward sweeping.)
I wish they had used whole pigs for their tests. I know it's a bit less "violent looking" to maybe use these manufactured dummies, and looks better to have a humanoid form, but using an actual animal that hasn't been butchered (beyond the internals being removed) would be a bit more resilient to damage than something that was put together.
Grant's final prototype was freaking
wicked and I wish it had worked better or been more practical. The slow motion shot of the blades sweeping out and then back in was just
nuts. Kudos and props to Tori for making a good device though, and he did it without causing himself great personal injury!
During their design phase I was thinking a device with an iris type of blade heavily tensed with springs would work. (I think the fictional/theoretical device uses something like an iris-like design.)
I don't have much to say on Jamie and Adam's C4 myth. I think it's been well established on this show before just how remarkably stable C-4 is. I still sort-of doubt troops are using it to cook food with, I suspect it's a bit more expensive than wood and knocking some rocks together or having a flint or something.

I guess in a
pinch you could use it, but... I'd be personally curious if burning the C-4 doesn't produce toxic fumes or some other by-product that you wouldn't want to eat lest you get sick or poisoned.