NASA's Webb Telescope's Last Backbone Component Completed

Assembly of the backbone of NASA's James Webb Space Telescope, the primary mirror backplane support structure, is a step closer to completion with the recent addition of the backplane support frame, a fixture that will be used to connect all the pieces of the telescope together.

via NASA Breaking News

http://www.nasa.gov/home/hqnews/2013/jun/HQ_13-184_JWST_Backplane_Milestone.html