i was thinkin, dont know what skill this should branch from but siege equipment, such as ballista, catapults and rams should be makeable at a siege workshop[basically like a quern but expensive, needs loads of bricks and boards and bla bla bla, when you want to craft something you right click then craft, no interior]. After it is constructed it should act much like a cart, as you should be able to drag it. After dragging and positioning it, you can fire it, you can use stone for catapults and giant arrows[made at siege workshop] , it should gradually do damage to palisades, walls, fences, and tall walls.
Tall walls should use twice the amount of resources as a regular wall, as they should be twice as tall. I think you should be able to add rooms to a house, visible on the outside and inside. You could put furniture like beds or couches that if right clicked you sit or lie on, if you logout on a bed you gain sleep, wich is like hunger exept you dont constantly have munchies from smoking weed in secret. Anyway sleep also raises the happy meter, if you lose to much sleep you get sad, and eventually depressed, this causes you to regen health quite slowly and almost no endurance, crafting should also take longer in depression.