Well I dont know, I think it can be done, but man not NOd, not had cybernetic units and mutants yes, but you forgot about CABAL, rogue computer...
Anyway here I bring terminators to Allies, and Cabal's core defender to Allied side, of course it is weaker than Cabal's version, but its still most powerfull unit in Allied Arsenal.... Soviets have Centurion Siege Emperor as their powerfull unit, and Yuri got Mammoth Tank... You know Apocalypse's weakness was soldiers cause that tank is weak against soldiers, but this Mammoth tank doesn't have any weakness, it even has more armor than Apocalypse, plus he fires 4 HE tank gns which can kill infrantry in one shoot, vehicles in 2 and buildings something like that... Also he has 4 rockes.. And cost of all 3 units is 2250$ or 2500$ I will see