But I cannot completely tell whether what I see is strictly mechanical (as opposed to, say electrical). Some of the lights certainly look like electric lights, but they may be just exhausts or vents for all I can tell.
The thing I am confused about, is how are we supposed to tell that it's strictly mechanical? We don't see much of the workings of the space ship, as they look your typical space opera spaceships that run on plot and engineers' sweat.