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Regarding me – I can help with ideas. That is, to formulate units clearly and precisely, new combat systems, etc. But in general, I'm a zero in modding, except for searching for images on the topic.
Bastion – is that Egypt?
I support Powder Brotherhood, but we need an absolutely accurate list of units and a unique ability. See the thread here – Technomancer Race; there are some interesting thoughts.
I don’t support Dungeon because there is already a pretty good Castle – Dungeon from the original Heroes, and you can also look at Dark Elves in Might and Magic V.
I support Eternal Forest; I came up with something on this topic myself: /topic/at/40112/ – and Witchers would fit well there.
I don’t really support Olympus. There are already Mages and a water-themed castle based on Greek mythology, and a race from the real world kind of… spoils the atmosphere. And as I said, there are already several castles where there are units from Greek mythology – titans, medusas, and others...
Pagoda. Let's make all the other races first, then we'll see. But I predict: elves and Chinese people next to each other just don't match. Races from the real world aren't meant for Heroes.
Palace. Hmm... I don't know anything specific, but there are already Djinns and Nagas in the Mage Guild castle. In my opinion, that's quite enough.
Kremlin. Again, a race from the real world. Yesterday, I would have been for it, but now I understand the disadvantages of this race – after all, it creates some ambiguity in the interpretation of the worlds – either it is Erathia or our own world with Russian warriors and witchers.
Whole. For. Almost without humans, inhabited by monsters that don't immediately evoke associations with our world. Make the interior of the castle nighttime – full of trees, lights everywhere, old willows, house spirits, and forest sprites... Yes, the atmosphere will be even better than the night elves from Warcraft.
Port – yes. I was thinking about this myself. We’ll talk more about this later.
Wandering City – a mishmash and lacks harmony, plus extra work… No.
Gothic City. Not exactly, but there are ideas regarding this. More precisely, not ideas, but a gothic castle.
Stronghold. I support Wood Elf Stronghold; no to Scandinavia.
Ziggurat. Yes.