It's been a while, but I got some of the sprites going. Modifying them really speeds up once you've done a few. Please let me know what you think so far with the stats/sprites. Here they are:
Captain of Carn Dum (pretty basic leader commander):
Gundabad Elite Warrior (cap-only heavy infantry):
Angmar Swordsman (heavy infantry):
Angmar Bowman (heavy archer/light infantry):
Edit...
Oh, also the Gundabad Shaman (best recruitable mage and cap-only, the random magic paths are 110% FWDB)
The berserk and reinvig on both the orc units are +4 and 3 respectively.