Gentlemen (and ladies, if any are out there reading this):
I have been prowling and growling around the edges of this campaign since the beginning, watching from afar with interest as you have presented your many well-done builds. Since I recently finished my own Panzer IV build, which I unfortunately started too early to enroll in this campaign, I have decided to start a new build, for this campaign. It is inspired by this same vehicle I saw on another website -done in 1/72 scale!
Here is my intended build in 1/35:

I won't be doing a full interior build but only the driver's side compartment. It will thus be a complementary build to my last Panzer IV (in which I did the entire interior EXCEPT for the driver's compartment). And I'm using the Verlinden interior set because, frankly, I don't want to have to do the amount of scratchbuilding I did on my last build. Nevertheless, I do anticipate that I will be adding to and modifying the Verlinden set somewhat to bring it up to snuff.
For those of you unfamiliar with this vehicle, it was the artillery observation version of the Panzer IV, attached to Hummel and Wespe batteries. It came equipped with three radio sets, an extendable periscope mounted on the turret roof and a Stug III commander's cupola instead of the standard Panzer Iv cupola:

I won't show you all the sprues (kind of pointless, I think) but I will show two items of interest to me:

Wire mesh schurzen (Drahtgeflechtschurzen)!

And Magic Tracks!
And what paint scheme do I intend to finish it in? The "ambush" scheme of late-war German AFVs:

So a Panzer IV ausf. J with wire-mesh skirts and ambush pattern - how cool is that? Way cool IMO! I'll get started on my build tomorrow and hope to have my first posting by next week. I'll embed my build log within this thread. Hope to have it done before the campaign expiration date of July 2015!