Armourfast Panzer Mark IV F/G's

These new Armourfast Mark IV's arrived in the post today, so they will be the next thing to hit the workbench once the current convoy of Russian tanks has trundled over the horizon. I'm going to try a different approach to painting these, which I originally experimented with when I painted my Pegasus Tiger II's, namely a grey undercoat followed by an all over heavy white camouflage wet brush. 

This is the effect I'm trying to replicate.

I did think of undercoating them in matt black, then wet brushing with panzer grey before the whitewash, but that wouldn't be historically accurate as by 1942 most tanks would be supplied in factory dunkelgelb. I'm aiming for a  more uniform winter camouflage effect with this approach, rather than the washed out streaking on the rest of the What a Tanker! panzers that I've already painted.