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

1) Will they be like the ones in the vanilla game, standing on the towers?))

Yes, but that's still up in the air. It all depends on whether [email protected] can get this animation or not. If not, they will either be melee units or they won't be included at all.

4) It's better to make them melee units. Will the Alt-Greade be in heavy armor?

We'll see.

5) Maybe make them ranged units, throwing stones. But what model should we use then?

The problem is that no one will fit. Besides, I have a couple of ideas:
1) the upgrade will be black and will learn to cast spells, and
2) the Alt-Greade will look like this - http://i11c.3djuegos.com/juegos/1207/warhammer_mark_of_chaos/fotos/set/warhammer_mark_of_chaos-128487.jpg