Several answers, first an article about a system, and concurrence about opinion of PDP assembly: https://www.i-programmer.info/news/82-heritage/12819-experie...
Article references a PDP emulator box that runs using a Rasp Pi: https://obsolescence.wixsite.com/obsolescence/pidp-11
That article mentions how they emulate the PDP-11 and other systems: http://simh.trailing-edge.com/