I would think that if you wanted sound in both sabers you will need a saber bigger than 12in. Maybe 14in but prob 16in.
To save space I would look at smaller slide switches or having the nice ones mounted just below the led on both ends.
Then finally you'll need someone to make a good quick disconnect so the sabers come apart without a lot of fuss. One which will also hold the internals in and still look good. That's the really tricky part.
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