import cadquery as cq
w0=cq.Workplane('YZ',origin=(-13,0,0))
w1=cq.Workplane('XY',origin=(0,0,-50))
r=w0.workplane(offset=27/2).moveTo(7.5,30.5).box(37,39,27).union(w1.sketch().push([(-3,-20)]).circle(6).push([(-2,-16)]).circle(1,mode='s').finalize().extrude(23))