To be somewhat Enterprising....

The knowledge you have shown is makes me want to shout"That's how you do it!". All the sub structures to support the model to prevent it from warping will make this a very long lasting model. ;)
 
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And the underside of the saucer

IMG_20210924_102253 (1).jpg

And now the gripe. The neck is simply not long enough! If you try to fit the saucer on the curve of the hull blocks the torpedo launchers! I spent quite a bit of time trying to figure out how to get this right. My solution, double it up! I luckily printed 2 copies and glued the spare inside the saucer as you can see above, with the original neck (with torpedo launchers) attached to the secondary hull. Interestingly the alignment of the saucer with the warp nacelles is also corrected with this, otherwise the saucer sits too low.
 
Great workaround... StarFleet needs to hire you to head Utopia Planatia...
 
Could you post some additonal pics illustrating the mistake and your solution, please? How are you joining the two necks? Are you pushing them into each other or using a paper strip?
 
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