This is my diagram of the cruiser-sized vessels that composed the Romulan fleet along with the Birds-of-Prey and the Imperial Flagship from episode 10 of SNW; "Quality of Mercy." Unfortunately, at no point do we get a view with decent lighting or clarity. Consequently, the diagram is a rough approximation based on my painfully anal scrutiny of the handful of frames I found that revealed any detail whatsoever. If we ever get clearer shots of the SNW Warbird in the future, I'll likely update this. :-)
On another note, the Warbird seems to be a victim of Star Trek's ambiguous sizing. While the number of windows on the port side indicates an utterly *massive* vessel, the few shots we got where a Warbird was in close proximity to a Bird-of-Prey near the end of episode 10 suggest that the Warbird is a bit smaller than what the windows would imply (Though still larger than a SNW Constitution). For the record, I decided to go with the sizing that's implied by how big the Warbird appeared to be next to a Bird-of-Prey. For the latter, one can get a decent size estimate from its close fly-by of the Farragut (~145 meters wide from nacelle to nacelle, by my estimate as the Farragut's saucer is 200 meters wide). From that point, there are a couple of shots where a Bird-of-Prey is close enough to a Warbird that one can manage a rough estimate of the Warbird's size.