G'day all, I have just uploaded the engineering drawings for the early PDP-11/05, the one with the solid (no slots) Mazak lower bezel and the M7261 with the unpopulated region. The latest date I can find in this print set is October 1973, Drawing release 11/05-49.
You can view or download it from https://archive.org/details/pdp-11-05-engineering-drawings-oct-1973 It is 147Mb in size, sorry about that but I didn't want the quality to drop too much (the raw scans were ~350Mb). Regards, Steve.