It's pretty good. I can guess you were aiming at the World of Warcraft Gnomeragan Exiles, but I don't know if there's any other fantasy stories and games that use gnomes as Engineers/Blacksmiths and such. Aside from it being blocky, the techno-stuff on the top is well placed, and the fact of it being a battering ram compliments the design; but again, perhaps just a bit too blocky.

wow nice greebles and stuff. but if its a gnome tank you should get some gnomes lol