I'll chime in to echo the previous correct answers you've already gotten.
Zimm yes.. all the 'late' A's at Normandy had it.. having said that there will now be 297 new photos surface of Late A's without Zimm..
Probably the tile pattern. But without digging for the pic of the exact vehicle, that's just a guess. Archer Dry Transfers makes some vehicle specific markings sets and they're spot on, for what it's worth.
Steel wheels, nope. Not ever on the A -again as far as I've ever seen.
They were on the G model and later, Battle of the Bulge and later.
DML's kit builds up very nicely. HAve fun.
If you're thinking about diving into Panther books, the Jentz book is the 'bible', but not heavy on pics. Spielberger is ok, and for modeling details I really like the Achtung Panzer Vol 4.
The Trojka Panther books are pretty and colorful, but should not be taken as much beyond speculative.. he's got some 'interesting' Infra Red info, but no proof to back it up.
Concord is bathroom reading, so many captions are a bit off..
Mike