HoMM VII Haven Units – Haven faction units from the seventh installment of Heroes of Might and Magic.

I have a question: is it possible to completely transfer a faction from Heroes 6 or 7 to Heroes 5?

You can transfer all models from Heroes 7, but they need to be scaled down (the initial size is enormous for Heroes 5), and they need to be stitched together because they are cut along the unfolded texture, and you also need to somehow redo the movement animations so that there isn't that awkwardness as seen here.

From Heroes 6, you can only do it the way Zakhar did: take a model and adapt it to the skeleton from Heroes 5.