Changing the subject a bit...
After much hard work (on the Dwarves' part, anyway; I just sat back and directed them), Towerscrape (or "Urdimigath", as the Dwarves call it) is complete! This is easily my biggest mega-construction ever, using roughly 20,000 building materials (counting doors and windows as well). Every single floor is fully constructed, with no hollow floors (quite unlike my bank tower mega-construction).
Thanks to a very intensive world-murdering campaign by an adventurer before I started this project, there have been quite literally no enemies to threaten the tower (besides the occasional roving Unicorn pack), and thus I've been able to focus entirely on the tower and not have to worry about sieges, thieves, or ambushes. As such, it took only 5.75 game years (started in early spring 35, ended late autumn 40). From mid-36 onwards was with Green Glass Blocks, which just goes to show how long it takes to build anything out of them.
Just over one-third of my fort's population of 159 are a combination of glassmakers and masons. Two-thirds of my fort's population (including the above group) dedicated a fair bit of time to gathering sand. The remaining third have kept my fort fed, watered, and financed with farming and metalsmithing. The fort has over two years' worth of food and drink in reserve, and a net worth of about 3.6 million.
And now, the obligatory screenshots.
A ground-based Dwarf's-eye-view of the tower.
From the air, looking down on the roof. My emblem there is made of steel.
An in-game shot of one of the many green glass floors.
Towerscrape Statistics:
35x35 base
18 stories tall + roof
388 3x3 "civilian" rooms
4 57-tile "dining" rooms
72 9x9 "stockpile" rooms
Building materials:
~10,250 Green Glass Blocks
~9,250 pieces of Shale
336 Green Glass Windows
265 Steel Bars
228 Stone Doors
216 Green Glass Portals
Tower decor:
238 Beds
212 Containers
202 Cabinets
95 Seats
95 Tables
15 Armor Stands
15 Weapon Racks
12 Steel Statues
12 Platinum Statues
10 Archery Targets
8 Stone Statues
3 Coffins
Catacombs decor:
187 Coffins
38 Green Glass Statues
20 Steel Statues