I've been meaning to post the new photo for a while. I've made a couple of changes then. The turret now sits on a raised platform more like the actual saladin it's based upon.
I've also added the blocks between the wheels, and I think these really give it a more solid, rugged look. Need to punch some more rivets, I've run out!
Finally I've removed the viewing port thing after deciding it was in the wrong place. I'll come up with a replacement and some armour for that section at some point.