David Riley [fraveydank at 
gmail.com] wrote:
  I've been more seriously contemplating my QBUS
multi-purpose
 card idea now that one of my other major projects is nearly
 done.  I've been unable to find any official or even
 quasi-official mechanical specs for DEC cards (QBUS, UNIBUS,
 etc).  I'm obviously looking in the wrong places, since
 there's a wide degree of uniformity; I'm looking for things
 like board outlines, edge bevels, component clearances and
 the like.  The electrical specs are in quite a few places, so I'm not
 worried about that.  
EK-BA200-DG-001 BA200 Series Module Design Guide.
That may cover things you don't need (like the "S" handles etc.)
but I expect that the physical specs for the board are the same.
Antonio
arcarlini at 
iee.org