I was browsing through some Trek material, and I found a single top view of the original Defiant concept. I fell in love with the design, for it is much more like a Starfleet ship. So I built her, it took most of the day. Due to the single view, I based the rest upon the FC flat ships.
Before you ask, she does look a bit like the Nova, given that this design was dusted off for the VOY episode.
And being the crazy man I am, I decided to set this ship as the official Polarisverse Defiant. So, this was the approved design of the Borg buster escort-warship, and a certain Commander Jared Colson probably had a hand in the design.
She will be released during my next release spree...
Model by me