You can only create Haven walls during a siege; you can add armored infantry and griffins to the church.

But can't you do it in the city itself or on the adventure map? Then it would be better to keep the old models everywhere. :)
It's better not to use griffins and armored infantry – this mod is specifically designed to add variety to the game! So you can play with new and interesting creatures! :)
In general, the creature lineup needs to be changed a bit:
1. Spearman _____________ Spearmen
2. Archer __________________ Crossbowman
3. Vestals _____________ Crusaders
4. Solar Angels _________ Vestals
5. Crusaders ___________ Solar Angels
6. Stone Guardians ______ Stone Guardians (I've made up a bit here because I don't remember what they're called)
7. Catapult __________ Light Dragons

Added 6 minutes ago
Here's why it's better to do it this way:
1) It's not good that the core of the army consists of some kind of female units; they can be moved to the 4th level and made into spellcasters, so the Crusaders move back 2 levels, and the Solar Angels move forward 1 level.
2) Crossbowmen are not used in any other faction, and the Lizardmen already have archers, and they are of the same level!
3) In my opinion, catapults don't belong in the army! Especially at level 7! Instead, you can use a mod that replaces Emerald Dragons with Golden Dragons.

Added 1 minute ago

1. A picture of some kind of battle
2. An old picture of me with a monk and a devil
3. The Dark Elves menu, but the lizard riders need to be removed, but the dragon should remain (at least recolored) because it flies next to the gnomes in the foreground, and they lose their balance (you can make black dragons neutral, and there will be no problems with the menu).

I like the first option! :)