As I’m in the process of being domesticated, I’ve been trying my hands on different stuff in the kitchen. (I did cook a lot beforehand, so I’m not a complete noob.)
Anyhow, trying to get a cake recipe right, it drawn on me.
Building armor models is like cooking. You do have the recipe, but there’s a lot of room to manoeuvre. You can add more of this, you can substitute that, you can just leave out something else; and the results will be -for the most part- still pretty good.
With aircraft on the other hand, you must be extremely precise, just like with baking. If the temperature is slightly off, if you add a tiny bit more baking soda, or do anything sloppy, the result will be, well, something that is certainly edible, but definitely NOT a cake.