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I wonder if the spare hull top that came with the CH Panther F would fit this kits lower hull?
It wouldn't really help if it did, as there were substantial differences between the Panther I and II upper hulls. Dragon correctly includes the rotating periscopes for the driver and radio operator, but incorrectly gives a Panther G engine deck (or speculates that a "production" Panther II would have adopted those parts, just as they have speculated that the Schmalturm would have been adopted). The prototype used Tiger II grills and radiator fan covers. One could cannibalize those parts from a derelict King Tiger kit (even one of the very old ones), but a lot of surgery would be required to remove the molded on grills from the Dragon upper hull.
The turret is the dismal, old, misproportioned Panther F Schmalturm, which has not been replaced with the better dimensioned part from the all-new Panther F kits. Again, this would be a speculative choice anyway, as the Panther II was scheduled to receive a very different turret (as shown in plan form in the relevant Panzer Tracts book published last year).
It really comes down to the individual modeler to decide how much correction to do to improve this kit (a really accurate Panther II would probably have to be scratchbuilt). A new turret would help (or one could depict the cast iron test weight as found on the chassis at capture), and new engine deck parts. The Doyle plans could be used to tweak the hull dimensions, too. One could try to fix everything, but it's probably a case of diminishing returns trying to shim and saw and sand everything to fit the plans, though I am sure there are dedicated souls out there who will do so.