Wow... And I thought Cryptic designs in STO were bad. That being said, I find no faults in your modelling. Just not a fan of the design.
To me, it looks like it's 2 ships (1 of which lacking nacelles), with the other ship being crammed into the first ones back side. If it's supposed to be just 1 ship, then those nacelles look woefully undersized for a ship of it's total size.