Random Generators of Things

I'm in the process of trying to teach myself something about Javascript. And I am finding it really hard, a lot harder than I thought it would be. Every time I think I'm starting to come to grips with it, it kicks me in the balls and runs away giggling. And unfortunately, I don't know enough to know what I'm doing wrong.

Anyway, as an exercise in Learning Stuff, I've thrown together these random Generators of Things from various dice tables I've collected from various places over the years.

Zvezda KV1 (1941)

 Here'a another 1:100 scale (15mm) KV1 from Zvezda, a slightly later model than the previous one with a slightly better 76.2mm gun. ...