The lavatory contains a long trough for which the knights can use for urination. Crude toilets are also included for defecation. The design is all stone walls with candles, and no privacy walls.
Lavoratory, Inside Castle
knight
king
I am a king of the whole empire. I give rules and pursuit them. I am brave and fearless.
Hows it going today? Good sir. I always envisioned myself gaurdian the king while he defecates. ever since i was a young boy. Thank you sir knight. Would not want to get caught with my pants down! aye who knows what kinds of threats lie just around the next pile  I'm thinking about haveing my builders put in an open air sky light. That would brighten thing up here here a bit and let out some of the stink Aye that would certainly make it a bit nicer in here. The things i here from some of the peasants youd think they could smell your royal hiney from here. what id give to smack a few around your lord. Oh..don't worry about it. Everybody poops.  That is why you are the king sir. Such eloquence. I wish I didn't have to make so many trips in here. It's that chef. He keeps feeding me beans! Say they are good for me and will make me stay strong. Ive always suspected the chef of being a conspirator. maybe we should serve him up for supper on the morrow. The queen won't let me. She agrees with him. Some sort of fad diet she is on after the prince was born. She is looking pretty skinny these days. Maybe time to have another child. hah if only i were your maester sir id suggest a new child every new moon. the cry for battle requires many young babes.