Squad-based 40K?

I was talking to a few people about using the 40K miniatures and lore with a different ruleset ... one that emphasized more realistic tactics, with a mixture of futuristic weapons and the Warhammer units.

Here's step one for converting 40K to Force on Force.

The Baseline
Imperial Guard
Troop Quality: Trained (D8)
Morale: Normal (D8), Confident, Normal Supply
Body Armor: 1d

Squad: 2x Fire Team (4 lasrifles each)
1x Weapons Team (1 Gunner, 1 A-Gunner)

Lasguns are a Class 0 weapon vs. vehicles.

Special Weapons:
- Heavy Bolter: 2d MMG, class I
- Autocannon: 3d, class II
- Lascannon: 6d, class III weapon
- Sniper Rifle (as sniper rules)
- Flamer (as flamethrower rules)
- Meltagun: 4d, class III, halve optimum range; no effect beyond optimum range.
- Plasma Gun: 3d, class III, acts as SMG

Upgraded
Space Marines
Troop Quality: Veteran (D10) (special characters and SM Vets: D12)
Morale: Good (D10), Very Confident, Well Supplied (+1d)

Squad:
2x Combat Squads (4x Boltgun, 1x Special Weapon)

- Boltgun: acts as SMG. A Class I weapon vs. vehicles. A roll of "1" indicates a jam -- reduce unit firepower by 1d for this turn.
- Storm Bolter: treat as a light support weapon.

Advantages and Limitations:
Bound by the Codex Astartes. Space Marines take advantage of their training and thousands of years of military precedent. Their formations are powerful but not fluid. Tactical and Assault squads may not use weapon teams.

Tough. Marine units do not incur a casualty penalty when a model is lightly wounded.

Power Armor. Space Marines get 4d of defensive dice. Their body armor does not slow their movement.

They Shall Know No Fear. Marines may not be reduced below D6 Troop Quality because of suppression fire or pinning. Marines do not need to make a TQ check when one of their battle brothers dies.

Modified Humans Marines use the "Modern with Medic" casualty chart at all times due to their genetic modifications.