Order of Operations

For tabletop quality, here's the process I went for. Everything is over a black primer coat.

1. Mechanicum Standard Grey basecoat entire model
2. Dawnstone wetbrush
• Care needs to be taken that this isn't just a basecoat layer - recessed areas should be slightly darker
3. Averland Sunset - chest emblem
4. Kantor Blue - shoulder pauldron fill
5. Leadbelcher metallic details
6. Blood Red purity seal wax
7. Baneblade Brown purity seal parchment & skulls
8. Agrax Earthshade armor recesses, purity seals, skulls
9. Nuln Oil any Leadbelcher'd areas
10. Touchup Dawnstone
11. Abaddon Black bolter casing touch-up
12. Drybrush hard edges
1. Over Dawnstone: Longbeard Grey
2. over Kantor Blue: Hoeth Blue
3. Metallic: Necron Compound
13. Seal with matte varnish

Faces: 

1. Rakarth Flesh base
2. Kislev Flesh layer
3. Reikland Flesh wash

Bases are Sector Imperialis.

1. Rhino Hide earth areas
2. Baneblade Brown (maybe Karak Stone) earthy areas
• Not super impressed with the color here, may warrant some iteration. Maybe Karak Stone?
3. Terminatus Stone drybrush earthy areas
4. Agrax wash earth areas
5. Leadbelcher metallic areas
6. Nuln Oil metallic areas
7. Ryza Rust metallics

Additional future work for these if I want to bring the standard up further:

1. There's no detail on the bolt pistol holster or grip.
2. I didn't do any edge highlighting along the pauldrons or bolter casting - the bolter casing probably has some good payoff.
3. Touch up the base edges to unify the black tone

I didn't drill out the bolter barrel either yet, don't @ me
edit: standard bolter barrel is 0.8mm bit size