Time for a Shadow Force

I've made a decision on where to start on Raven Guard.

I'm going to build a Shadow Force. For those of you not in the know, it's a Formation from the Kauyon book that consists of a Captain (or Shrike), Sternguard Squad, Vanguard Squad, and a unit of Landspeeders. The Captain cannot have Terminator armor. The formation as a whole gets Acute Senses, Move Through Cover, and Scout USRs. In addition, the units can reroll their Run moves, or move an additional 6" when going Flat Out.

Very tame, but with a lot of options for deployment and movement around the board. One funny trivia point about the Speeder unit is that if you take three in the unit, you get +6" on Flat Out from the Codex as long as the unit still contains three models. In theory, you could have a unit of Speeders that moves 12" in the Movement phase and then Flat Out another 30" (18" for Fast Skimmer, +6 for three models, +6 for Formation bonus. That's Eldar-level movement without the pointy ears.

I've already started building a Landspeeder. Just putting the last few magnets in it, and then priming the subassemblies. After that will be the Captain, as I need an HQ to make my existing Scouts usable as part of an Allied Detachment until the Formation is complete.

The Captain will get a pair of lightning claws and a jump pack to represent some of the awesome relics in Kauyon. Swiftstrike and Murder are the claws, with standard lightning claw statline, but also Flurry, which gives him a free attack roll for every hit he's already made in assault (but no extras from the extras). So you can have five attacks on the charge, hit all five, and get five more bonus swings.
The relic jump pack makes his Hammer of Wrath hits S6 with Strikedown.

One thing I can't decide on is if I want my Sternguard to have tabards or not. When I first planned to paint Raven Guard, I wanted them to be very sleek and largely undecorated. I figured that ninja Marines didn't do lots of bling and decoration, and I really hated the white arms GW is using for RG Vets these days. But as I looked at the GW models in Kauyon, the fancy-pants Sternguard models started to grow on me. I'm not sure I like the tan tabards and white arms, but I think I might be able to modify the scheme to match my Scouts. It would look a little like THIS. Just more white for the fancy armor bits, and likely a white helm as well. Anyone have any opinions?