darkroastedblend.com is a (confusing) source of real and imaginative pictures and cheerfully doubious information - I don't think the "Strangest Tanks in History, First World War" links have been given before (I hesitate to put this under the "References" section):
Very interesting. Of note to me is the Rybinsk tank, which looks like a scaled-down Mendeleev; without hull overhangs, it seems a fairly practical design.