The L shaped outlines are gray, not red. Here is my top view with the two different engine room sets to scale (947 length).
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And here is a closeup that should have more detail.
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Thanks! So it looks like the L-shaped areas would not quite work as removable covers for the engine room "bays," as I had hoped.
Does the first or second set of grid lines match the location of the undercut?
I thought the Deforest Kelley reference would have been enough, but I am happy to expand on my work.
No, obviously De is not in the Rec Deck scene. But since the rear walls were reassembled into the set that became the "Officer's Lounge", we can use his height to get a much better understanding of the wall's dimensions, especially those details on the same level as Kelley:
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And while the Rec Deck is a less clear image, we can still measure the dimensions of the outer window frame and the size of the bay and see that they match those of the Officer's Lounge
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Finally, while 8' is more or less in line with the width shown in the various scenes (it's hard to be sure because of those angled frames) I really can't see how how they are in any way comporable to the Rec Deck windows shown on the model.
In this photo of the model the saucer rim height and Rec windows are both visible.
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Knowing that a 1,000' long Enterprise will have a 20' thick rim, we can deduce the following dimensions:
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Now that image isn't entirely flat to the camera so the windows might be slightly wider, but not twice as wide!
In fact using Big Jim Slade's plans (with do feature a flat orthos of the Rec deck octant) the windows measure out at 4'9" wide which is not unreasonable:
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However, to fit 13' bays in there would require expanding the windows to near gigantic size!
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Suffice to say, no part of the Rec Deck set can fit into the rim of a 1,000' refit Enterprise![]()
Based on this, I still think that we could just say that this set in the secondary hull and that those windows are the big blue ones.
Going back a few posts, I finally got around to putting words to sketch. I hope @yotsuya doesn't mind me using his artwork, but here's my concept of putting the S2/3 Engine Room in the saucer off the main 50 ft. dia. corridor (my scaling maybe a little off, but you get the idea). The turbolift path is up one deck (upper rim deck), and the Engine Room sits on the bottom rim deck extending up into the upper deck:
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I like this concept, and this is great artwork! As I am a fan of making the pipe structure to be of a large size, why not just make it go all the way to the end of the saucer and line up with the little circle between the impulse engines? That would let the pipe structure connect to them to power them or vice versa. Still, its remarkable to see the set fir in the saucer this way.
The lounge wall may depict a viewscreen in the movie, but it is constructed from the same set piece which made up one of the lower levels of the Rec Deck and as such has the same dimensions.
I thought the lounge is supposed to have windows at the back of the bulge on top of the saucer, just like is precedence on later ships.
I want to add, I especially like the orange ladder outside engineering being in the thickest part of the saucer, so it could be used to climb straight up all its decks, or most of the them.