Ahriman
Tyrant
I'm sure it will work fine and I look forward to trying it; my one hope is that you continue to differentiate factions using other mechanics, such as a diplomacy bonus for Atreides and special spy missions for Ordos, Fenring and BGs, and make the Hark slave mechanic more useful (sacrifice slaves in cities for production boosts). I think Fremen will need a ton more UUs; they should be a much more infantry-oriented faction with worms; good naval power but weak on land because they should lack the artillery, suspensor units or mechanized vehicles available to other factions. There need to be more mechanics than just a few UUs and UBs to actually make the factions play differently.