Good stuff, good stuff.
How much do they cost?
Can do they be hired?
IMHO, it would be nice to release creature mods when they are totally finished, and it includes graphics for their dwellings although I can understand that the feature to include objects can be not implement yet in VCMI.
I’d remove dwarves from the preserve and put them into own facton, then move sprites from elemental to preserve (fits much better), then add new level 1 to elemental. The preserve dwarves could be a nice start for a dwarven faction.