Okay, this is confusing.

Alright. I am making a hero in my RPG.

I want one to be DRuid of the talon.

I gave him druid of the talon model, using the keeper of the grove base.

I gave hime verything the druid of the talon, with the exception of hero abilities.

Now...when I try to change into Storm Crow form, it says the models don't match.

But shouldn't the druid of talon model match the druid of talon crow form model? So the transformation can take place?

This doesn't work with metamorphasis either, altough it works with avatar. Because the game cannot handle transforming other models to a demon/crow, it automatically assumes that any custom unit will not work and gives an error. In my opinion it should check the model instead, but it doesn't.

Use the guy with avatar as a base unit, then extract the crow files from the mpq, and put them into your map under the same entries as the avatar ones.