Putting on a good show is more than just sounding good. I can listen to Iron Maiden or Motorhead any time I want, but seeing them is a visual experience as well. The attitude that they convey in their music is as much associated with image as their sound.
Sure. And well, I don't consider a few boxes a "visual experience". It's just as (or more) cool when you don't see any cabs at all. Seen a Maiden set lately?
Remember, Lemmy's stack is a Marshall Head, a 4x12 and a 4x15. And he uses 2 stacks. And that sir...is ****ing cool.
... because Lemmy is in front of it. Any joker can stand in front of a stack, doesn't make him/her cool. Definitely doesn't make them Lemmy.
If you don't have the inherent masculinity to play with a boner for the entire show the vegetable idea isn't a bad idea. Zucchinis and rutabagas are the best.
Ok you've got a sense of humor, I'll give you that.

But hey, I wasn't the one suggesting relying on useless augmentations for stage presence.
Cardboard boxes with red paint would just look dumb. Use real blood!
Prop cabs aren't bloodworthy. If it's to sound good, it's gear. If it's to look cool, it's a prop. If it's to look cool, while blowing speakers and sounding crappy, it's doesn't just
look dumb.
Remember...you don't want to look like your faking it.
Now, you've got the idea.
A single 6 or 8x10 would do the job. Any fEARful setup with multiple woofers would do it. A pile of 12's might be good. If you want maximum "big-cab cool factor", at least do it right and run a skyscraper of 15's.
Don't run a single 15 with a 4x10 unless you're using it just as a prop, and don't mind when it eventually turns into one.