Phase II Bridge
Phase II - the aborted Star Trek series that was converted into The Motion Picture
The Phase II bridge was almost completed before the order came to alter it for TMP. This posts follows it from concept art, to construction, to conversion.
First came the bones of the bridge - the wooden support structure for the walls.
After that the walls and ceiling surround
Various wall consoles added
The helm
A new addition to the bridge compared to TOS was the inclusion of a bridge transporter situated next to the view screen. This would be removed for TMP and replaced with a small console for gravity control.
Also a tactical display was added - it was to be a large translucent dome with small models of ships to move with the action. Ultimately this was scrapped for a tactical station in TMP.
The consoles were even gained displays and were wired up
By the way - here is what the back of a console looked like
During the conversion to the TMP bridge, some test shots were filmed with the actors wearing the Phase II costumes.
Finally it became the TMP bridge we all saw on screen
It would receive a revamp for ST:IV
Sections would late be converted into the TNG battle bridge and redressed into a myriad of other sets.
The turbolift door sections would survive into the Enterprise-E bridge for First Contact, Insurrection, and Nemesis.