I'd read about this years ago, lost where I heard it, and just rediscovered it today. From a 1982 interview with Franz Joseph Schnaubelt, via Trekplace...
Can you imagine it? Bridge scenes like the interior of the Galileo shuttlecraft...Franz Joseph said:When the Enterprise was first sketched in the design as it now appears, but not the arrangement used in the TV series, it was originally intended to be a vehicle about 180 feet long, with an eight-man crew riding in the cab on top. The cab was a long l cab, like an Aerocommander airplane, with the pilot and co-pilot sitting in front, and the rest of the crew sitting behind with viewscreens in front of them, like in an airplane cockpit.