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I found it on this guys blog...
Scarpia
Sadly in reading through some of his posts it appears that he no longer plays 40k. However... I think a monolith converted into a battle fortress count as battlewagon just for fun sounds amazing. I think it would look dead sexy next to my Stompa.
I will not call it a looted Monolith, and I do not choose to get into a fluff debate. I will just call it "Orkspiration" and say that some Mekboy decided to build a rolling pyramid.