While the wirewolf in the Traitor general books were human shaped, I like you're idea of making them lupin in appearence and technically with the added info given on them in "blood pact" they could be any shape the craftmen making the metal shell want it to be. but while I like your design, the wirewolf was described as something akin to an empty armoured suit, that when active was filled with daemon energy. so there should be no machinery in it like you've drawn. or was it a conscious decision?
The stalk tank design is really cool. if a little heavier than I imagined it.