Not the 8/I, or indeed amy member of the -8 series;
but I have seen a
pedestal-mount PDP-11 in the wild - most likely an 11/40 or 11/45 -
which was used as a controller for an early theatrical lighting control
board. It was in the Opera House in Seattle, and was long since retired
when I came across it in the 1990s.
Sounds like a cool beast :)
Alas, it was destroyed a few years later during a building remodel. I
wish I'd had the forethought to go after it. :/
Oh well, so many computers so little time. Unfortunate that the more odd
ones are lost though.
Cheers,
Pontus.