Settlements really don't leave you a lot of room to build when you get them, I've got a few walls, some beds, and two vendors at the castle and it's pretty full. I know you can kinda glitch some more space in, but they shouldn't give you an area to build in and then have it two thirds full already. Also the amount of items is pathetic, looking at the mods on PC where they've unlocked a ton of things to build I don't understand why they would only given so few things compared to how much is out there.