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Officio Assassinorum:
Assassinorum Operative - 150

Vindicare Assasin

Skitarii:
Dominus Maniple - 425

Tech Priest Dominus
- Eradication Ray

10 Skitarii Rangers
- 2 Transuranic Arquebus
- Omnispex

Onager Dunecrawler
- Icarus Array

Imperial Knights:
Barional Court - 1275

Cerastus Knight Castigator

Questoris Knight Crusader (Warlord)
- Stormspear Rocket Pod
- Meltagun
- Lord Baron
- Sanctuary

Questoris Knight Paladin
- Twin Icarus Autocannon

Rangers and Vindicare sit back, hold objectives and try to snipe enemy meltagunners/powerfisters and the like.
Dunecrawler sits in cover and protects my back line against deepstrikers/flyers.
Dominus tries to move up with the crusader while staying in cover and marks targets for the reroll to hit bonus on the formation.
Castigator goes after light vehicles and transports, destroy them in the shooting phase, charge the passengers in the assault phase.
Paladin shoots pie plates at MEQ and charges bigger vehicles/enemy super heavies, also has some extra anti air just in case the Dunecrawler can't handle it by himself.
Crusader tries to stay close to the Castigator so both can fire overwatch and close to the Dominus so he can get repaired if needed. Thermal Cannon for TEQ, Stormspear Rocket Pod against bigger vehicles.

Thats the general strategy, not sure on the Dominus Maniple wargear (I have not played any admech, so I have no idea what the good wargear is and what weapons are worth taking).
I think the Dominus is a great addition to a Knight army because he can move up with them and they can run to him for repairs if in need. And by taking him in the Dominus Maniple I also get an extra anti air platform and a big unit to hold objectives with.