There's some square-cube issues in scaling this up. Specifically, material strength is proportional to cross-sectional area, while the masses of the structures (and projectiles) involved is proportional to volume. The video hints at this with the mention of the difficulty being proportional to the length of the arm to the 1.6th power, slightly more than 3/2.

I was thinking it would be more fun with a rotten cow.

A rotten cow might disintegrate before it leaves the launch site. I wouldn’t classify that as fun.

That strongly depends on your vantage point. Definitely not from the point of view of the cow.

Rotten cows have limited perceptions.

Sourcing?

Rotten cows ... write no research papers.

Assume a spherical, rotten cow...

nm

A sphere is a perfect form, and hence, immune from corruption.

Pink mist with subsonic bone shrapnel would still be a terrifying siege weapon.

"Fetchez la vache?"