RTF is a global modification that replaces all towns in the game.

And for humans, as a neutral cavalry unit. Humans can't be without cavalry. The evil dwarves will trample them:))

Added 3 minutes later

Trogolodites are already planned for the Dark Dwarves.
Approximate orc lineup:
1) Goblins - ranged units
2) Orcs - melee units
3) Orcs - melee units
4) Centaurs - ? (melee or ranged)
5) Trolls - melee units
6) Ogres - melee units (Panther Warriors from Heroes 6)
7) Black Wyverns - flying, melee units

Added 32 seconds later
2 and 3 levels - different units.

Regarding the lineup:
1) Will they be like the ones in the vanilla game that stand on towers?))
2), 3) No questions.
4) Better as melee units. Will the upgrade be in heavy armor?
5) Maybe make them ranged units, throwing stones. But what model should be used then?