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First, I'm not going to make a mod for one person, and I'm not going to make it in the near future. First, you need to think through the game mechanics, and that will take a lot of time.
Second, I have a negative attitude towards Russia, but without hatred. The two races are due to the fact that it was supposed to introduce some human units and "good" undead into the Kremlin. This explains the movement in space (otherwise, the appearance of Cossacks or druzhinniks cannot be explained). What about just a Kremlin made of Slavic good undead without humans and without transitions? Our mythology is the most familiar to us, so we can make 2 races.
Gothic city - I'll try to explain it again. This is a city of the religion of Darkness, vampires, and werewolves. A similar city is being made in DF2 in the new cities section.
Pagoda, Scandinavians, Palace, Bastion, even Ziggurat! - if you take pseudo-Egyptian or any other mythology, you need to preserve the spirit not only in the units but also in everything else, of course, without blindly copying the original. I am for the fact that pure fantasy, like Rampart and Fortress, should be diluted with pseudo-cultures. The same Castle is a pseudo-culture of the Middle Ages.
Vory - I thought about combining northern myths (turses, valkyries, skalds) + Vory + 1 human unit - a Viking. You can remove the Viking, but a race consisting only of Vory is a bit boring.
Revival - regarding what is on your forum, I have already written in that section, regarding what is on DF2, it is being created strictly according to D&D.
10-11 levels - I think it should be like this - 7 levels + 3 upgrades + 1 after the Grail, and three more selectively or "programmed to the maximum".
Regarding the design - it turns out something like this, I myself am annoyed by it, I will come up with something.
Too many races - there are never too many! Some people have dreamed of more than a hundred.
For now, I don't have any problems with systematization, so I can bring the basic races to completion without interrupting the creation of new ones, and regarding discussing something else (not races), please express your opinions.
Added 19 minutes ago
I have some kind of mess with my computer, so sorry if the last messages are duplicated.
Regarding the Powder Brotherhood - I can't imagine a gnome with a sword, although this is not critical, a race consisting only of gnomes is a bit boring, even the Castle has griffins and angels.
Personally to Mugaisu:
Okay, thank you, just tailor it to Ascension.
Personally to Moses:
Join in, I'll be glad! Only the mod is being made for HoMM3, not for HoMM5.
Elven question:
Gentlemen Gamehuntera and Silvanis, I seem to be having some kind of broken communication with you. I say that there will be no elves in the Pagoda and in Egypt, you say that they are not needed there. I officially declare that there will be NO ELVES in the Pagoda or in Egypt!
Personally to Nowizard:
I don't quite understand, write a more detailed concept. The elves are already divided, and there will not be enough units for 2 Chinese and 2 Powder Brotherhood units in this system. Or should they be thrown out of this system?
Regarding the defenders:
They will not be stronger than level 5, they will be in a single number and you will not need to buy them (only the building). They are made so that the hero does not capture the castle for free, without a battle, this is somehow implausible.
Sorry for possible typos, I was in a hurry