There's more than a little artistic license in that shot, mainly in how that's the only time that upper sensor dome was ever implied to be transparent. Every other time we get a close shot of the bridge dome, that sucker is better described as translucent. And it should be noted in the remastered version of that shot, the "camera" dips down a bit before the final pull-in, indicating that, yes, the bridge is at the bottom of the dome. As for the question of scale, I really can't say for absolute certain, since it's based more on the breakdown of the deck levels and eyeballing things so they look right. I'm shooting for the 947' length, but I'm not completely married to that exact figure. For the record, I'm not a big fan of the 1080' theory.