Sorry for the long post, but it's a bit hard to explain in a just a couple of sentences.
I'm pretty sure the Miss T. building is not a version of the Whirligig Theatre building but it's actually a modified version of the Doppler Cinema building, which is a modified version of the IRL Pacific Theatre building. I think.
The Pacific Theatre & the Doppler Cinema both have a few arches on the side of the building at street level. Both IG & IRL arches are a perfect match.
The Miss T. building has arches all the way around at street level. They're a slightly stretched & modified, but still have the same basic features & details.
On the top, the Pacific Theatre has two layers of detail.
The Doppler Cinema only has one of these details, while Miss T. has both.
The Miss T. building also has 4 windows between the main columns, while the Doppler Cinema has 3 like IRL, but other than that all 3 buildings have the same windows.
Now for the Whirligig Theatre. This one is a bit of a mess.
Like you said Fido, the regular windows & the arched top windows are most probably from the building at 6381 Hollywood Blvd.
The street level must come from another IRL building. It's possible we may have already found it & it's used somewhere else in the game.
Those extra square windows & details on top may also come from the same IRL building as the street level, but could come from a different one altogether.
The El Capitan Theatre entrance comes from a completely different IRL building that doesn't seem to have any other matching details.
So, on the map, the IRL building for Miss T. has been changed to the Pacific Theatre building.
I've also given the Whirligig Theatre two separate dots. One for the theatre entrance & one for the main building.
I hope all that makes sense.
Edward, I've been a bit busy at work (& doing this ^^), so I'll try to post the South side of Vinewood Blvd tomorrow.