Reconstruction of Doma

MysticLordDo you mean a standalone hack that's just this, or some sort of event sequence in addition to the normal game?

I wonder how hard it would be to make certain field maps part of save ram, and to create event commands to modify maps...

I did mean this in addition to the normal game, for an endgame sidequest

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To set clear expectations, this would be a major hack, and it would not be possible without an expanded rom. You will need new NPCs, new maps, and quite a few event bits. There are certain event bits that will replace tiles in a map with modifications. It would have to be done through event code, and while it is not terribly difficult, it takes a lot of space, as you have to define a new tilemap within the event code, tile by tile. Moving NPCs is something I did with Divergent Paths, as I allowed you to recruit a crew of 5 people aboard the Falcon. It's a lot of event editing, and you will need to duplicate each NPC and assign 2 event bits to each one (one for displaying them at location A, one for location B). However, it's doable.

So yes, you can, but it will take a long time. The issue is not the technology, but the available space.

Ah, good to know! Where would I find extra space? I read in the Cyan’s Uneventful Dream patch that it opened up ~1300 bits, is that useable for event hacking?

Cyan's uneventful dream could be used to accomplish this, yes. That will get you 1300 bytes of event space, 25 npcs, and 25 event bits, all detailed in the readme. 1300 bytes is going to disappear very quickly once you start updating tilemaps based on event bits. For a model of how to do that, check the event on the Ship's deck of Albrook when you talk to Leo. The game, rather than cutting to a new map with the ship at sea, simply replaces all of the dock tiles with water and calls it a day.