Yeah, that certainly makes sense. Still, you can have a solid stone hull but if the pylons-hull, pylons-nacelles and "neck"-saucer connections are not super-rigid, you WILL have problems. But the studio model had ample room in the engineering hull for the electrical wires of which there were plenty added. Of course, AMT model won't have lighting on just the starboard side, with a large area of the port side of the hull dedicated to wire access as the studio model had. On the other hand LEDs are much more space-economical.
I think a more important factor in preventing nacelle and saucer droop would be to reinforce the weak spots as AMT outlined by utilizing very rigid armatures and as light as possible materials for the nacelle and saucer shells. Master Replicas tried the metal armature but the vast majority from what I've gathered--if not all--of those models were not spared the droops to one degree or another. Not sure why really... maybe it had to do with the "Made in China" execution.