The only thing I wish Terra Incognita would let me do is bring over NPCs from the main game, even if they're generified in nature.
You will never live a comfy life with a harem of Pippa, Elle, Barbella, and the Princess of Tantegel.
There are human NPCs. I recommend favoriting those because they can still produce things in work shops and kitchens. Since you need fertilizer to grow crops I recommend making a bistro or bsr ASAP crockery coubts as display food. And anything you build on the home island affects the island like a base in the main game. So that Ironmonger Studio will give you that durability boost until you get your unbreakables.
Treasury is impossible to make in Terra because colossal closet does not count as a coffer. So just combine your closet with your carpenter workshop.
And yes having seperate workshops let your humans build different furniture which saves a little resources and time. Just don't expect NPCs in Terra to build the frequency of stuff like in the main chapters.