The painting is not finished yet, but here are some progress shots of the scheme. I am painting by hand as I do not (as of yet) have an airbrush, or indeed any skill with one. The intent is to go with a 'rubble' or broken city style camo pattern, to match my troops.
Starting with Automotive Primer (grey). This is very close to Fortress Grey:
Added a 'wash' of Codex Grey mixed with water:
Painted on irregular splashes of Shadow Grey:
I originally added contrast splotches with Fortress Grey, but the wash was a little too thin, and came too close to the color, so I mixed about 1/3 Skull White in with the Fortress Grey to add the contrast:
White irregular pattern triangles to break the colors. I will be adding black slashes shortly:
Still a lot of work outstanding, the final pattern break: black slashes, washing around the rivets and joins, drybrushing and touchups, and then adding the tracks, which I pre-printed using the textured tracks provided. I have not yet settled on markings; I have printed templates for world and designation, and will try to make paint-patten blanks with them. If that does not work I'll likely try a steady hand. I may also use a colour pattern on the front side armour, to match with some of the GW coding I've seen.
I've not settled on whether or not to build and use the 'extra' armour over the tracks.
Enjoy!
Sean