Here is a video of them positioning the cockpit on the newest Goodyear blimp. May require a registration to view, but interesting. It does not look like the process has changed that much since the hey day of blimp building.
Having grown up with smelling distance of Goodyear Plant 1 (now the world headquarters) and two grandfathers who worked for Goodyear (at different plants) the Blimp has always been a constant in my life. Even today they use the Wingfoot Lake in Akron to park the Blimps at whenever they are in the area.