Marines Malevolent Custom Scheme Schedule/Plan
With the help of Wise Windu, I've been able to finally figure out a few things as far as the mod is concerned. So, I'm going to list a quick future roadmap/plan for what I have in mind for the MMs. The main issue right now is that I need to recolor all the Marines Malevolent armors to their specific scheme, which is actually really rare in the world of wh40k.

Without Windu's help, I was basically hitting my head against the wall, but now I know to edit the _tem files. The planned edits will be Sunburst Yellow for primary, Black for secondary, Silver for Tertiary, and Sunburst Yellow for the Fourth color.
This thread will serve a dual purpose of keeping the community up to date as well as keeping me honest: Now that I've made what I intend public, all the more pressure to actually make it happen!
The predominant piece of armor will be Corvus Armor and Corvus helmets, which is grounded in the fluff. I actually haven't read the book, but I was interested enough in these guys to dig up all this information.
1) Yellow for standard troops
2) Red for sergeants
Officers will generally be wearing codex-regulation Maximus helmets with variants being:
3) White for veterans
4) Red with a white stripe for Veteran sergeants(there is a theory that the right pauldron chevron is used to denote this kind of veterancy instead of the vertical white stripe)
The custom helmets will be painted black in the _tem file so that they do not take team colors. In addition, this will mean that if someone wanted to implement Dark_Riku's guide to mod elmo colors, they will be unable to edit the colors of the helmets.
The Marines Malevolent also use an unusual shoulder chevron marking to distinguish veterans from the average squadmates. This is in the shape of a black hazard chevron on the right shoulder. However, I'm not sure if I can actually get the chevron to extend to the corners of the pauldron.
Hazard stripes on weaponry also denotes proficiency or veterancy with said weapon, similarly to the Iron Warriors. However, the Malevolent's striping is denser.

I'm going to try to put striping on bolters for veterans and chainswords as well.
I've extracted this to act as their chapter badge, but honestly, a higher resolution image would do wonders:

Force Commander
Full set of Mk4 w/ plenty of purity seals and badges
Apothecary
TBD
Techmarine
TBD
Assault Squad
Squaddie: Yellow Corvus(assault_marine_head); powerarmor_rare; corvus_brace
Sergeant: Red Corvus(assault_marine_head); powerarmor_rare; corvus_brace
Devastator Marine Squad
Yellow Corvus(assault_marine_nobackpack); powerarmor_common
Devastator Plasma Cannon Squad
Yellow Corvus(assault_marine_nobackpack); powerarmor_common
Dreadnought
Land Raider Redeemer
Librarian
White Librarian Maximus helm
Predator
Razorback
Scout Squad
Scout Squad will be unchanged
Sternguard Veteran Squad
Squaddie: White Maximus Helm; powerarmor_epic
Sergeant: Red w/wh. stripe Maximus
Tactical Marine Squad
Squaddie: Yellow Corvus; powerarmor_rare
Sergeant: Red Corvus; powerarmor_rare
Terminator Assault Squad
TBD
Terminator Squad
TBD
Vanguard Veteran Squad
Squaddie: White Maximus Helm
Sergeant: Red w/wh. stripe Maximus
Venerable Dreadnought
Whirlwind
Be warned: Everything above can be subject to change.Changelog:
03/19/15 - Golden Yellow to Sunburst Yellow because I fail at differentiating between colors.