I'd probably go mephiston red base, agrax earthshade wash, with a flesh-tone highlight. Ill see if I have a spare marine I can do a mock up before you invest in any paints.
Automatically Appended Next Post: Okay. So here is a VERY quick and dirty prototype for you It's army painter wolf grey and mephiston red doused in nuln oil wash. I gave one or two cursory highlights with cadian flesh for the red and fenrisian grey for the armor. Hope this helps.