First Airbrush makes a good point. If you don't care about being historically accurate, go for the zim, but I am sure you won't ;)
Second, the Tiger 1 Mid pro is a great start for trying zimmerit, but I highly recommend you break out some old models or a few feet of Stryrene to practice on, just so you can get a hang of it. Once you do, you'll be a pro.
Third... late Jagdpanthers had a Red primer as far as i know, According to Achtung Panzer, this was the case. So i say go for the salt technique. It is something i would like to try myself on a future model.
Your right dj, alot of German Armor at the end of the war left the factory in just it's Red Primer (very similar to many T-34's during germanies invasion of Russia)
On a side note, I will be partaking in a few zimmerit projects for Ron's site (possibly a Brummbar, Tiger 1, and Stug III with waffle pattern zim) all using Tamiyas polyester putty.
Cheers
Mo