The German Heer - what will I look for paint wise

I want to keep my 28mm Germans as generic as my 20mm ones. So I've been looking for tutorials how to paint these models in generic German Grey. I'm looking at this:

FOW painting Guide

I used the 1940 example when painting my 20mm's and I think it is good enough to paint my 28mm with. Fortunately, Christy Beall made this excellent tutorial with just what I need (that and I've added Crusader Miniatures to the list of mini's to buy as I like their 5cm mortars and AT rifle teams):