I'd argue that raising an undead army is itselft a craft project :p
Is it a sweatshop when the skeletons dont sweat?
Haha! No sweat glands? See someone's previous comment about lungs & muscles.

Also why are they always human skeletons?
You have to search around a bit, but there are non-human skeletons. Beastmen are easy to fake with skull swaps, though the legs will likely be wrong. I've got skeletal orcs, dwarfs, lizardmen, ogres, etc from a few different manufacturers. Plus larger beasts.
I like your idea of a stampede of undead cattle! Rotting zombie cattle might be even better than skeletal ones, and easy to convert! I may have to steal that idea.
