After seeing the new Excelsior class I decided to try a new version of the Constitution. The nacelles are not meant to be exact to the Sagan Class. But is meant to show that it is from that period. First time I have included a room. The one on the bridge module is the Ready Room. The one facing forward is going to be the Mess/Lounge.
Only suggestion I have, is maybe keeping the impulse engines in the saucer? Maybe cut into the saucer edge, to make it look a bit more sleek than the TOS/TMP impulse engines on the Connie's. The neck area isn't that wide, filling it with the impulse engines in that area would limit possible movement from the saucer to the secondary hull.
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Included quick and dirty example: