Now how should we explain variable height of the bridge dome?
Just out of interest... Is there any recycled stock footage that would require us to believe in a variable-height bridge?
I mean, the shot from the rear that reveals the, um, lack of balls is from such an angle that the bridge height is not an issue. OTOH, the side shot that shows the older bridge and the nacelle spikes is most prominently seen in "Mirror, Mirror" where it depicts a wholly different ship. Is there another reuse of the side shot elsewhere in TOS? Probably at least half a dozen people here know the exact details on this like the back of their hand...