Russ,
I don't know about others but I always appreciate a full build review like this. I recently reviewed the SdKfz 70 version with basically the same cab and undersides. I am glad to hear that my analysis and your experience basically are similar.

it's also great to see that the supposition about Dragon making further variants of the Protze were not amiss.
The PaK is not without it's challenges as you aptly noted about the gun shield and it's supports. With care, the trails can be moveable but do lack the towing eye. A few crew figures would definitely have added to make the kit that much better.
Cheers,
Jan