There are some size comparison type images of the Niagara floating around which come from the Star Trek Fact Files and some of these are seen below. I originally took these images at face value and based this entry on them, but on later examination it appeared that these images cannot possibly be right - you can see a capture of the Wolf 359 scene on the images link above, and it clearly appears that the Niagara has a nacelle directly above the engineering hull flanked by two more, one on either side. This lead me to discount the Fact Files version of the ship entirely and come up with my own version of the ship, together with a rather extensive version of this comments page to support it.
Unfortunately, as it turns out the Fact Files was right after all. On a recent visit to the Ex Astris Scientia site - one of the best on the web for stuff like this - I found an image of the actual model used for the USS Princeton. Various damage had been inflicted on it for the battle, including having the nacelle struts significantly bent out of shape. In addition, the shot we see in Best of Both Worlds is not in fact from directly above the ship, but rather it is turned at an angle to us. This makes the elliptical saucer section look fairly circular, and also further distorts the positions of the nacelles.
So, we're back to where we started from with the Fact Files version of the ship being correct. Those who want more detail on this - including the picture of the Princeton model - should go to the Ex Astris site via my links page.
Below, then, is the real layout of the Niagara class nacelles.
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