Building and Raiding.

[Mozzarella]

One of the first things I have noticed upon building is that everyone can see the insides of your base, knowing exactly how to get to your loot. This is not only annoying, but makes it harder to keep your precious items safe. Also, there should be more traps and defenses. The only way to keep someone out is by spamming walls and doors, which is boring and not fun to make, or raid. With that being said I really enjoy the building system, and believe it's refreshing from the usual systems in other survival games.

[Lurler]

Currently there are several ways to make insides of your base invisible. Simplest of which is to slowly expand it, including adding more claims.
But we do actually consider adding roofs in the future. Just not right now, as we are currently working on other tasks.

[Djekke]

There no need of an actual roof let's just pretend that we have it.
Room definition would be great: automatic and manual definition like how it done in RimWorld, DF, etc.
Dynamic Field of View would be awesome, that there is no way to look over walls, and over solid objects. But as it a really complex system, that is hard to control from server code - at least do it the way, that it can hide fully enclosed room contents.