import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,6))
r=w0.sketch().push([(-25.5,-6)]).rect(23,20).push([(21,25.5)]).rect(36,49).push([(20.5,25.5)]).rect(33,27,mode='s').finalize().extrude(-17).union(w0.sketch().segment((-39,-4),(-34,-16)).segment((-13,-8)).segment((-13,-50)).segment((-1,-50)).segment((-1,-5)).segment((-13,-5)).segment((-13,-7)).segment((-17,4)).close().assemble().push([(-7,-27.5)]).rect(4,9,mode='s').finalize().extrude(4))