A global mod that replaces units.

So, I would like to create a mod that replaces all units and, possibly, heroes in the game. The Factions will remain the same. There are already some ideas for 4 Factions: Castle Beasts -> Furies -> Megeras (Complete reskin) Trogolodites -> Hell Trogolodites -> Chthonians Hunters -> Trackers -> Shadow Hunters Dusk Witches -> Shadow Mistresses -> Mistresses of the Night (body, arms, and head of Djinns from Heroes 7) Manticores -> Scorpicors -> Ancient Manticores Minotaur -> Minotaur Guard -> Minotaur Hunter Dusk Dragon -> Dark Dragon -> Red Dragon Tower Kabiri -> Elder Kabiri -> Firestarters Gargoyles -> Obsidian Gargoyles -> Elemental Gargoyles Golems -> Arenite Golems -> Jade Golems Djinns -> Djinn Mediums -> Djinn Viziers (all male) Rakshasa -> Rakshasa Raja -> Kshatri Rakshasa Magic Birds - Simurghs -> ? Colossi -> Titans -> Shanti Titans Inferno Hunter -> Ranger -> Sheldon Marksman Fairy -> Nymph -> Oceanid Blade Dancer -> Blade Master -> Sea Dancer (a pirate from Heroes 7, but in a new style) Druid -> Druid Elder -> Sea Druid Unicorn -> Light Unicorns -> River Unicorns Ents -> Ancient Ents -> (not yet invented) Green Dragon -> Emerald Dragon -> Pearl Dragon Haven Marksman -> Marksman Veteran -> Archer Wolf -> Fierce Wolf -> Battle Wolf Acolyte -> Preacher -> Vestal Guardian -> Legionnaire -> Zealot (will use models from Heroes 7, but instead of a spear, they will have a sword) Chaplain -> Abbot -> Healer Cavalier -> Cerasi -> Knight of Light Angels -> Seraphim -> Celestial Warriors