This (http://www.coolminiornot.com/shop/miniatures/micro-art-studio/scifi/ib-stalker-tank-mk-1.html)?
(http://microartstudio.com/studio/Products/IB_stalker_mk1/spider01.png)
Sort of scream Adeptus Mechanicus, doesn't it? I mean, you wouldn't even have to convert the thing! (Though it'd be a crying shame not to.) I suppose that's probably the general idea. So, er, who's got a spare US$65? :P
I saw that (Cool Mini Or Not newsletter) and thought it had excellent Necron potential. Love the avatar, by the way :-*