You can see more of it in the extended DVD of Razor, in the shipyard when Shaw is arriving. I would offer to get some more screencaps, but I don't think you really need them now, do you?
I'm also not sure about scale in those shots...the Galactica type Battlestar looked much larger than Pegasus. I suppose its possible they could have built some Battlestars larger than they did Galactica during the war, but it doesn't make much sense.
I'd agree that the Berzerk is about the size of the Valkyrie though, based on comparison with Pegasus.