I don't know whether this is just too far afield, and if the moderators see fit to remove the thread I fully understand.
That said, here's some video footage recorded inside the Record Plant shortly before it closed.
It's my late friend John Chelew recording a Peter Rowan album there (Dharma Blues).
Footage includes the control room and the kitchen (where he and Peter are working out the arrangement to one of the songs).
download link:
https://we.tl/t-rKgZw1rXLT