Sorry about the update silence. As much as I'd like to dedicate lots of my time to updating this, real life things really like to get in the way so progress has been slow. Rest assured though, the update isn't dead.
As for the prior discussions regarding one dimension for pockets, etc., we can't say very much about the implementation since it hasn't been fully decided. What we want though is, travel between pockets will (hopefully) only be possible through dim doors. There will be no mapping of coords in the pocket dimension to coords in the overworld, rather links can be created between any two points.
We're still very early in the rewrite, so these things may possibly change. If anyone wants to pop in and say hi / ask us questions, we have a discord channel here.