HOLY ^$%&^%*U^&#%^@#$%&(^!!!
I can't even
find enough obscenities to describe the über-eliteness and skill you have put into this and other ships. It looks like it came straight out of Joseph's Manual.
Anyway, one minor nit. Instead of clustering the 4 phaser banks together, why not spread them around a bit, to suggest the future phaser arrangement of the
Excelsior? That wouldn't look to bad, and might give it better fire arcs.
MINOR NOTE:
I imagine the
Mars' comissioning around 2267, since the
Federation and other NCC-21xx vessels were about. The Transwarp project probably took 20 years, so they might've reserved the NX-2000 registry for the
Excelsior back when construction first started.