This looks to me like the power supply and backplane of a PDP 11/05, looks
to be in nice shape. Surprised no one grabbed this yet, esp someone with
an 11/05 that has issues with power supply. Someone might have the missing
parts.
"DEC PDP-11 Digital BA11-KE Mounting Box"
https://www.ebay.com/itm/DEC-PDP-11-Digital-BA11-KE-Mounting-Box/28265372079
granted "all you need are the cards and the front panel" reminds me of the
steve martin routine. "It's easy to be a millionaire, first get a million
dollars and then ...."
Compare with
http://vintagecomputer.net/browse_thread.cfm?id=622
b