Sounds like you are describing the 11/05 10" system unit.
It's a standard chassis. 11/05S IIRC
I was under the impression that 11/05S refered to the later version of
the CPU board set (which could end up in any mounting box). The main
differences to the user being a couple of jumpers, one to disable the
console port (allowing you to use a normal DL11 card for this), the other
to diaable the bus arbitration, allowing the machine to be a slave
processor on the Unibus of another machine (!)
It has a 1 rack unit panel below the front panel.
And a 3 rack unit panel above the front panel.
It has the power supplies along the right side (if you're facing the front
panel)
Odd. The 5.25" box is like that, but the 10.5" one I saw had the PSUs
across the back. It was the same box (BA11-K) as is normally used for the
11/34
-tony