This quest is not available in game.
Bring 6 Mithril Tubes, an Accurate Scope, and a 2 Advanced Target Dummies to Oglethorpe Obnoticus in Booty Bay.
If you're ready to make some truly fantastic devices, then you've come to the right place. And I can see you're a skilled engineer, but I want some samples of your work. What I hope to do though is to analyze your craftmanship for ways to emphasize gnome-oriented techniques in your future efforts. I need the following samples: six mithril tubes, an accurate scope, and two advanced target dummies.
Submit these items to me and you'll be an official gnomish engineer with access to all the schematics!