First thought, wouldn't the name be Eisenwulf?
Second thought, it's got a very Marsden II feel to it, which isn't necessarily a bad thing. The Marsden II isn't necessarily a great tank in it's own right, but it's a great starting point to making a great tank.
All in all, I like it. You might consider a fuel cell engine for a later era (post jihad) update. It would be basically an overall upgrade, but fuel cells don't really become common until after the jihad.