Note: This deck does not use each card 3 three times, half by limited pool and half by testing something more flexible than with 3 times each card.

Units:

2x Flagellants
2x Huntsmen
2x Sigmar's Blessed
2x Warrior Priests
2x Pistoliers
2x Nuln Tinkerers
2x Talabheim Detachment
2x Bright Wizard Apprentice
2x Gold Wizard Acolyte
2x Reiksguard Knights
2x Thyrus Gorman
2x Vigilant Elector
2x The Greatswords
2x Johannes Broheim

Supports:
2x City Gates
2x Shrine to Taal
2x Church of Sigmar
2x Contested Village
2x Abandoned Mine

Tactics:

2x Franz's Decree
2x Forced March
2x Sigmar's Intervention
2x Ulric's Fury
2x Iron Discipline
2x Surrender!
2x Innovation

This deck is based on annoying the enemy until you sweep his zones either with weenie masses, pumped greatswors or taaled johannes.
Most of the units provide actions, on should use them.
I am a bit unsure about how long to develop, I need to play some more rounds with it but it seems to be working good.

I definitely think that Empire has more to gain from diversifying than other factions; they have a lot of situationally strong units. Even the ones you've left out, like Free Company and the Nordland Halberdiers, are playable. For a tournament deck, I think the only cards that have to be there in triplicate are Innovation and Contested Village (not too hard with Assault containing an Innovation). In your build, you have a lot of dorky guys that are good at Questing, like Sigmar's Blessed, Talabheim Detachment, Flagellants, and (sometimes) Vigilant Elector, so I would think about getting Ancient Map along with Infiltrate! and Defend the Border into the mix. The cards that are on the bubble in my view are: Surrender!, Franz's Decree, and Bright Wizard Apprentice.

Yeah, I will go for a third innovation.
I dont think Infiltrate is that good for this deck, I noticed it is more likely to deck itself because it need many cards. Perhaps I will include Map + Border + Prepare for War.
I added Surrender! because it is a great card against the enemies faties or infinite blockers. Franz's Decree the same but also against attackers. Bright Wizard is there against Chaos sniping. But perhaps Sigmars Church and Iron Discipline are enough.