Well you wont be able to produce, Frost Wyrms, The statues and destroyers, gargoyles, banshees, and so I am adding new units to replace them.
I want the zombie to be a very light unit to help out KelThuzad and the Scourge as a special unit, Ghouls will be the main unit to make. Acolytes could be the ones who harvest gold and lumber for the Scourge, Necromancers are built in the Temple, and I am probably gonna add the Wright or Wraith a new ghost like unit.
Abominations will be the same, but I am going to use the Frozen Throne abilities they have for my campaign. Would it make sense if Crypt Fiends were part of the campaign?