1. Not sure where you are asking about ... sounds almost like the kings quarters.2. That is the treasuer room - you access it via the deposit slips (not very obvious, many of us have spent *years* trying to get physically into the treasure room).
3. Locked door - don't know. Swing just seems to be window dressing.
4. Ornate rod is used in the room (next door, side by side) next to where you found it, to activate a teleporter - you probably need another key for that door.
5. It is not in the game. Must have been planned, but never made it.
Tools for Wizardry(r) 7