Hivedwarf files are at
http://dffd.wimbli.com/file.php?id=4340 - feel free to tweak them however you desire. The dwarven hive mod tends to be very difficult right now, as the dwarven caravan is turned off so you are basically expected to grow your hive from the two immigrant waves and the seven dwarves you start with.
The raws there include the playable dwarven hive civ, a rival hive (mostly the same, just has caste ratios bumped so the castes who don't learn military skills don't show up in raiding parties), and the spider-elves (four castes, increasingly monstrous).
Hive nobles don't mandate, they only Demand, but they need hugely expensive rooms - especially for your militia captains and commander. Only females can lead military squads, but you don't get that many females and they're needed for other jobs, so good luck.
It's my intention in the next version to set the pop ratios for all castes to 0, except for basic Drones (can't learn any skills except brewing), and to create reactions that create 'hive jelly' that can advance said drones to more useful castes. Ideally, I could then make the Hivedwarves' wagon be made of hive jelly, allowing an embarking player to have a useful set of workers from the start.
And regarding the Titanium / Steel debate, DivideByZero seemed (to me) to be inflammatory first - possibly unintentionally. Please be careful about what you type into discussion, as it's really easy to sound more critical than you actually mean to be.