Like you said JES, I based my design, not only on the final ship but also on some previous sketches. There were many variants before the final one. I decided to refrain myself from adopting a saucer shape, but to keep: the docking nose, the engine's look, the winged top liaison bridge, the frontal energy phaser (yellow). That said I was mostly interested in the engine design and the Chaffe shuttle. It's also bigger then the defiant, kind of an evolution toward a real starship instead of a corvette.