That whole building that OMD is in was originally the post production facility for the studio. It had working editing bays and space for post production. It also had 2 additional "sound stages". These sound stages were fake and not true filming locations. The first one was in fact just to house the down ramp for the walking tour exit from the actual sound stages. This sound stage eventually became the separate space for the temporary attractions like Prince Caspian and Jack Sparrow. It no longer exist. The original walking tour then went through the current OMD area showing off the post production facilities before leading into the second of the 2 fake stages. This had the finale of the tour showing off previews for upcoming Disney films. The stage was quickly turned into the theater for the live Muppet's shown then became The Little Mermaid. When the theater was re purposed an additional fake sound stage was constructed right behind it to house the ending of the tour, this theater is now the OMD preview theater.
View attachment 282572
This is a fantastic photo of the Studios before the opening of the park. The actual studios was in operation at least a year ahead of the theme park in order for there to be something for guest to see. The buildings are as follow:
1. Not exactly sure of the original purpose of this building but most likely its studio operations / maybe also commissary?
2. Mechanical power and water.
3. Again not 100% sure but I believe its vehicle maintenance/ operation
4. The original prop storage. the parking area around it would soon become outdoor storage as well as the original location of Walt's Plane.
5. 3 (latter 4) Production Bungalows. These were office spaces for the production companies filming at the studio.
6. Costuming production, you can see the tram tunnel on the right of the building
7. Scenic Shop where all the sets were built. In between the costuming shop and scenic shop was a lighting shop for all the studio lights and a camera workshop to keep up the shooting equipment.
8. Residential Street for filming.
9. Future location of Catastrophe Canyon. Was never an actual film set.
10. The water tank and special effect warehouse that formed the beginning of the walking tour. Latter on this became the start of the tram tour.
11. the 3 working sound stages used for filming.
12. The fake sound stage used to bring the walking tour back down from the elevated walkways.
13. Post production.
14. The original ending of the tour, now is The Little Mermaid show.
15. The former animation building and original start of the tram tour. Now is Star Wars Launch Bay
16. Original tram loading station.
17. Earful Tower. Was never a actual functioning water tower.
18. Great Movie Ride
19. New York Street set, were originally actual filming sets and part of the tram tour.
Hope that cleared up some questions.
Oh and the look of the entire studios was supposed to mimic the astetic of the Walt Disney Studios lot in Hollywood.