Hi Robert,
you have a very goodlooking Jagdpanther there... and I seriously hope mine turns out only half as good. I like the was you used the rack for the spare track-links to hang some extra stowage on.
I do have on nitpick however. The one thing on Jagdpanthers which did NOT receive zimmerit was the added on stowage bin, or at least not in the pictures I have seen.
The bin is thought to be a feature specific for Schwere Panzerjaeger Abteilung 654 (though someone on this board came up with a pic supposedly of a JP belonging to another unit)). Neither the mongraph by K-H Munch on this unit, nor the Militaria booklet about the Jagdpanther had any pictures with the zimmeritted stowage bin. As Mike stated the stowage bin was an add-on (and not even to all JP of 654) and I think that is the reason they are not zimmeritted.
A few add-ons to Mike's statements, concerning the modifications:
You see the modification (relocation of tools) already on the early models. In fact, the first pic I see this for certain is on page 441 of the monograph by Munch, with Jagdpanther 314, captured by the English on 1 August 1944 at St. Pierre.
In the same book there is actually a list of recommendations (accompanied by sketches) for improvements of the Jagdpanther (including relocation of the tools) signed of by the battalion commander on 25 July 1944 (page 314-318).
Another alternative for determinig the version (early/middle/late) often mentioned is looking at the gunmantled and the barrel. Again, this is dangerous, as I have seen both the flush (early) and bolted mantled with single-piece and two-step barrels, late models with bolted on mantlets and single-piece muzzles and an early version with the bolted on mantlet (though Zimmerit was mostly gone).
As far as I know, the determining features for the version are the drivers'periscope (two vs one) and the roof (late version has three extra "thingies" on the roof, look like mounts for something).
As said before, your modell looks awesome.
Hope this helps a bit,
Harm