Thanks from everyone for the very kind words on the model! Very much appreciated.
Chris - great to hear from you, it's been a while. To answer your questions, I used Aves Apoxie Sculpt for the Zimmerit. I broke the laborious task into several small sessions, and probably ended up choosing a pattern not quite correct for the particular vehicle I was doing, which was a 12th SS Pz. in Le Villeneuve June 9 1944.
You are right - decals just wouldn't work well on the surface, especially the rear of the turret, so I cut out the numbers from a decal sheet and used it as a mask, and sprayed the red letters on, then tried to carefully outline them with off-white Vallejo.
Here's a "work in progress" with the John Rosengrant figs that'll be for the eventual vignette:

Cheers,
Gary