Buntfarbenanstrich is the scheme you may like to consider, German pre-war camp pattern using three colours, there is a decent Faceache page for the scheme, with lots of pics
https://www.facebook.com/BuntfarbenanstrichThe colours quoted are
Nr. 17 Erdgelb-matt (“matt earth yellow”)
Nr. 28 Grün-matt (“matt green”)
Nr. 18 Braun-matt (“matt brown”)
The paint colours are not the same as the later three colour scheme adopted in 1943, the flak gun pic posted is in the later scheme, so the colours are incorrect.
In July 1937 the Germans switched to the new Dunkelbraun Nr.45 and Dunkelgrau color scheme, but many vehicles retained the early pattern until well into 1938, when all vehicles were orered to be painted in the grey brown scheme.
Here's a few samples.


Uniforms, in an effort to disguise the make up of the force, and make them look less "German" the troops were kitted out in a Khaki uniform, based on a more Spanish look, they also kitted themselves out in local items too.


<a href="
http://s732.photobucket.com/user/higgsnfw/media/Spanish%20Civil%20War/mainegauche06_zps6ee9746f.jpg.html" target="_blank"><img

if you want to consider a different tow for the 88mm, they did use the Henschel truck in Spain.
I'm going to modify the Perry Miniatures Afrika Korp crew for my 88mm.
Hope it helps mate, look forwards to seeing the finished model
