Likewise, don't know how I missed this, considering I've recently built the Roden version. Very interesting to see this, thanks for showing it off.
From the look of the PE, I think you made the right decision on the wheels. The Copper State ones are impressive, aren't they. But most odd that they didn't allow for the turret height difference. I think you've found a more accurate shade of 'Battleship Grey' than I did

Just look at that chassis from below. These cars would never have survived today, in the era of IEDs would they?
Cheers
Mark