The saucer could definitely use more shaping. It should be Miranda like but it doesn't have to be the Miranda's saucer. It really only needs two Miranda elements, the sensor inserts on either side and the step, I also like the narrowing as it goes back since it makes it a more interesting shape, but that isn't required.
For the secondary hull, what about the below, think it's really slick and balances some of the chunkiness.
As you currently have it, I think the two main problems are how you brought the broad side protrusions all the way back, it's a problem I didn't want to deal with.
I can see the appeal in doing it that way, but I think once they're past the last torpedo tube they should taper inward until they blend into the hull. Alternatively, they could cut off as abruptly as they are introduced at the bow which is artfully done. Naturally, you can copy it directly with two more sensor inserts at the aft facing aftward. That would involve the shuttlebay being flanked by inset sensors or inset sensors just aft of the final two quad phaser banks on either side.
From the side, the current protrusion shouldn't have that cutout, at least not in that form. I think it should mirror the hull's fan tail cutout, or with a sudden enough cut-off it isn't an issue.
Lastly, the bottom of the fantail cutout is squared off for some reason, that should really be round, as the roundness of the hull should continue straight back.
I just remembered another limit on how the turrets can be placed, they cannot be placed over nor under the shuttle bays. The turrets are supposed to penetrate the hull several decks kind of like real life large turrets. Although, they don't penetrate to a realistic level considering their size. The gun pods can be placed above and bellow the shuttle bays because they penetrate the hull less than one deck. The below image is a somewhat practical arrangement, however, it is not to the same scale as the side view images. At least I think it's a different scale, I'm pretty sure the turret is smaller in this image relative to the ship. More importantly, notice how I made the red circle the extent of the barrel, not the base of the turret. On real ships they put a red circle on the deck to delineate the full extent of the turret's swing zone. Also, note I marked the center of the turret and adjusted its base by lifting its rear, since the part that touches needs to be centered forward more to fit the tight swing zone. Also, the center is where the pivot point of the barrel should be for up and down swing. But, you can make the adjustments you like. If the ship is large enough to handle larger turret scaling, that's great.
