I used to price some items by wood types and or newness ie expansion levels, thus an older throne chair plain wood may only be 350gp, if in heartwood or frostwood, natch it would be more gp. And the wood hogging furniture with later expansions, like some SA throne might be 500gp, for it in plain, it's more of a wood hog.
I didn't really charge more for a bench be it in wood oak or ash even but frostwood they paid more for same dorky bench.
I used to make everything with items to match, in wood types or colors. Storage chests unless wood hog types be 350 gp to 500 gp if it only took x amt of boards be cheaper, if it hogged more wood even plain it be more. I didnt always go by what the prices of boards were either, per say, more on how simple or annoying something was to make.
As for addons, they varied, I seen small forges go from 45ogp to 1.5k here, even 2k. Large forges were 2k on up to 3.5k even, looms 2k usually give or take 500gp up and down. Really depends on you and your restocking etc. and furniture only sells when folks really need it or are remodeling etc. so I always had other deco stuffs just to keep the vendors in gp all the time, even goza mats sold when someone *needed* em.
As for granite furnitures, GAH pain in arse how they made that even worse, than higher end woods nearly. I used to enjoy making granite furny in ALL granite colors, all sizes each direction, plus matching chairs etc. but yeh good luck getting enough valorite granite rocks to do that or shadow !

I sarted those tables of plain at 1k and 1.5k for the larger table, 300 gp or less even for the matching chairs since we got o'd of plain granite. 4-5k for shadow /copper/bronze, then gold agapite be more, with verite valorite more...simply cuz getting enven a good 20 of valorite granite to even do small tables and matching chairs was pain in arse those mighta gone for 7k or 8k depending on how annoying a day it was or more to get enough verite or valorite granite rocks enough to do diddly with.
Good luck with whatever ya try to accomplish and sell though, cuz I always enjoyed making it all for whomever needed it ...whenever they needed any of it all.

I just loved carpentry etc. and all the stuffs we could make to furnish everyone's UO homes. So I sold it all whether it moved fast or not, most knew if they needed it sooner or later they knew *Miranda* would have it all whatevers, on her vendors.
Just call ye vendors HOME DEPO and plan accordingly for when they DO need to buy it ...it will be GONE and ya get to restock it all again again.

Enjoy !