The time had come. King Sarvesh II and his entourage arrived at the new Mountainhomes of Ubalålath. Striding past the corpses of many goblins and elves, they approached the gates. The drawbridge lowered, revealing his welcoming procession; nearly the entire fortress was bowing before him.
The monarch signalled for the one in the center, Duchess Asob Cilobshar, to stand.
"Your Majesty," she said with great reverence, "You grace this fortress with an honor of which it is not truly worthy, but which it accepts gladly. Thank you."
"It is an honor well earned." replied Sarvesh. "Now then, take me to my royal suite!"
"Yes, Your Majesty! Guards!"
The dwarves of the Royal Guard, who had been rehearsing the procedure for weeks, accompanied the Duchess and King as they proceeded into the fortress, while keeping the awestruck crowd at bay. They passed through the grand central hall of the newly-appointed capital and into the king's new throne room. Behind the gem-studded platinum throne was a door.
"Your Majesty," said Asob, gesturing to the door.
Sarvesh entered and looked around. It was a small, cramped space, with rough-hewn floors and walls. The furniture was of the worst quality, and clearly built by amateurs. But in the corner was Izegebgok, the artifact giant cave spider silk bag made by Urist Datanònul in 211.
"It's beautiful," he said, "Truly a room fit for a king!"
As it stands right now, a room lacking in one aspect can make up for it by excelling in another. I propose that to be a certain quality, a room must meet a minimum requirement in all aspects of value, not just an arbitrary net value.
For example:
Meager quarters - Bed.
Modest quarters - Bed, chest, 3x2.
Quarters - Bed, chest, cabinet, 3x3, no overlap with other rooms.
Decent Quarters - Bed, 2 chests, cabinet, 4x4, smoothed, all furniture well-made or better, no overlap.
...etc
...etc
Royal Bedroom - Bed, 10 chests, 5 cabinets, 10x10, smoothed, engraved, all furniture masterwork or artifact, no overlap.
These numbers are just examples, it could be anything.
"But Walliard," I hear you saying, "won't this mean more trips to the wiki every time a noble shows up to determine their exact needs?" Not so. For I also suggest that the holdings screen allow one to +/- through the rooms to get a list of exactly what is needed for the room. This would end up being more newbie-friendly overall, since they would know exactly what constitutes "Fine Dining Room" without having to smooth, engrave, and throw in as much good furniture as possible and hope for the best.
You'll also notice I've rolled the chest/cabinet requirements into this system. That's not necessary, as it would take away some decorative freedom, but I thought I'd throw that out there. Maybe individual dwarves could have their own preferences on where to place their auxiliary furnishings.