I’m sure this is nowhere near the top of anyone’s personal build list, but just in case… The Bashir + Data clip came up on my YouTube feed and despite having seen this ep plenty of times, it hit me that I recognised the main body of the prop.
This is made from a pair of Singer Librascope hard drive casings:
I recognised this because a modified one was used as the base unit for Mr Fusion in Back to the Future. Presumably it came from the same LA surplus yard.
These things are impossibly rare now but I do know a BTTF contact with one. He might be willing to mould it but obviously that would be quite expensive so it would probably necessitate a run, which seems… unlikely. Anyway, just thought I’d throw it out there in case anyone was interested in making one…