import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-6))
r=w0.sketch().push([(-12,23.5)]).rect(50,53).push([(-12,24)]).circle(2,mode='s').push([(27,-27)]).circle(23).finalize().extrude(-7).union(w0.workplane(offset=19/2).moveTo(-26.5,-2).box(47,34,19))