I like this idea and explanation, but is it really feasable?
I think it could be pulled off easily enough - but I don't see the rationale. Why would the bridge be in any way crucial to a mission profile? Shouldn't it be the sensors or weapons being swapped, rather than the generic controls and monitors?
Surely the replacement module would have to have the same dimensions or else there might be a gaping hole in the hull?
No doubt. Although it could easily be of a different shape, sometimes two decks tall, sometimes consisting of three separate towers, whatever floated the particular boat. It would suffice for the bottom layer to fit over the hole.
Today's modular warships have things of that sort for real. The German MEKO concept has standard-sized holes into which you can drop a DP gun, a CIWS system, an ASM launcher, an SAM launcher, a sensor, a jammer, whatever - systems of completely different shapes and sizes, just with a common pedestal box.
Would the turbolifts not have to line up exactly?
Probably not. After all, that's the very reason the writers came up with the bridge swap concept - because different movies showed the turbolift doors at different locations.
Remember that the turbolifts are individual cabs, free to move in three dimensions. No doubt every bridge type includes at least a short stretch of horizontal shaft so that the cabs can shuffle themselves while they wait for the next customer at this key location; the doors probably are always located well away from the hole down to the lower decks, so as not to block it from use by the other cabs. I'd assume a
Constitution refit has two shafts down from Deck 1, as seen here:
http://movies.trekcore.com/gallery/albums/tmp/themotionpicture0300.jpg
The actual doors on Deck 1 can be positioned at arbitrary sectors of the bridge, as long as they
aren't atop these shafts and blocking them...
However, again I would think that swapping the entire bridge would not be necessary or sensible. Rather, the various slices of the bridge pie probably can be pulled out and replaced, so that what once was a science console can be swapped for a doorway, a turbolift station or a mini-transporter with minimum fuss.
And then there are the links from the various stations and terminals to the computer core, what if the new module features a terminal where there wasn't previously? How would this link up to the computer core (unless it's all wifi!)?
I'd assume the computer would be flexible enough to accommodate the plugging in of all sorts of new systems, all across the ship. Sometimes one would have to install extra cabling, but usually there would be generic sockets just waiting for these new systems (and in most cases never receiving any).
Timo Saloniemi