@Talkie Toaster: I think the main problem people will run into, if they want to really execute Johnson / Blanche's work in a 2D, top-down representation, is that most of those details will be pretty difficult to render from the top view. That, and I think that that Frigate needed to be executed at about 2X its current size before any of the smaller details could be large enough to really be appreciated. That means a Battleship of the line would be pretty darn big, though, and I'm not sure Starfarer can handle stuff that big gracefully.
@medikohl: I like the central-glow thing, that's really cool
In terms of critique, I think the missile launcher sponsons aren't well-integrated with the rest of the design. I'd really like to see that sort of detail planned out to fit with the rest of the ship; sure, the weapon sprites hide it in the final result, if it's mounting all 4 launchers, but that's also a bit problematic; ideally, the weapons shouldn't hide so much of the art.
It'd take a fair amount of pixel-work to fix the sprite as-is atm; I don't suppose you still have it in layers somewhere, and could post it without the launchers? I'd give it a go and try to demonstrate what I mean, it's often easier to show it rather than just talk about it
Here we go, a concrete demonstration, it wasn't as bad as I feared
Basically, this pushes the launchers a little further out from the body, so we're not just seeing them and the turret, and it integrates them with the body in terms of light and shade, so they don't look like they were just stuck on at the end.
I also fixed various areas where light and shadow weren't consistent and detailed things out a little bit, to sharpen some of the lines and details.