I will do this weekend. I have other things planned to do before the skaven mod, but I am finding it hard to resist doing graphics for them - plenty of source material (unlike warwind) and so on.
I just had a thought for the warpfire thrower as well - if it gets hit it switches to a temp form called 'Damaged warpfire thrower', becomes immobile and gains a high power heat aura which should burn the skaven/enemies who happen to be near. It also gets a precision reduction to about 1 or so - if it fires the shot could fly pretty much anywhere. Represents how very risky skaven contraptions are. Similarly the globardiers would emit weak poison clouds (making stronger ones on impact with their thrown globes) but only be 50% immune to poison.
I like your ideas a lot. The poison cloud globadiers would take some thought to get working well though - they might easily be doomed to die in any battle that lasted more than a turn or two.
I don't suppose you could have them explode in a poison cloud when they die? I'm thinking probably not. Or you could have their first form in battle be a 4hp 'Composed globadier' (obviously you need a better name!) who has his globes well under control, but once he gets hit he goes a bit careless (changes to his alternate form) and starts waving them around and leaking poison gas. Well, it's a thought at least. An unfortunate side effect of this rather bizarre method would be that they'd all effectively have two lives, like jaguar warriors or skin shifters, which doesn't really make sense.