Sector 17 is a sector within Gnomeregan. The entire sector belongs to High Tinker Gelbin Mekkatorque as his private quarters, where he prefers to have a practical abode, rather than a fancy one like most of the other Alliance leaders. The network of hallways in Sector 17 was a physical representation of Gelbin's creative process: library connected to drafting room connected to simple foundry connected to assembly chamber. Research, imagination, creation, engineering. This was where numbers had been rallied, partnered with iron, and sent marching forward.
If one did not know better, they'd believe the place to be some crazy old geezer's library.