IIRC there are a couple of fairly standard serial protocols for
controlling PTZ cameras. Hooking them up would likely just be a case of
correct cables and enough ports to plug them into.
I don't know how difficult getting *all* the cameras to stream would be,
but I'd say first priority would be using fixed cameras to ensure full
security coverage, and then at least one PTZ in each room for web-control.
As 90s as it may sound, perhaps a "virtual hackspace"? Have the PTZ cams
embedded in a members page with the IRC chat. Make it a bit more
interactive than invasive.
Previously it would have been seriously impractical to suggest it, but
with the network-controllable power-strips that also arrived recently,
the ceiling-mount speakers and RFID access controls we could really make
a "smart space". Show what's currently in use, maybe who's using it
(with opt-out/in of course), etc.
If the speakers can be addressed individually, I'd say pair each one
with each PTZ cam and get remote text-to-speech alongside the web-based
cam controls. With user-ID announcement of course. EG; "Message from
user 'Russ': Please stop being on fire."
In the more immediate term though I'd just suggest making sure any fixed
camera over the welding area has a decent UV filter so the sensor
doesn't get burnt out.