import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,5,0))
r=w0.sketch().push([(28,-3)]).rect(44,46).reset().face(w0.sketch().segment((6,-4),(12,-17)).segment((50,-1)).segment((45,12)).close().assemble(),mode='s').finalize().extrude(-46).union(w0.sketch().segment((-50,1),(-5,1)).segment((-6,26)).segment((-50,25)).close().assemble().push([(-6,6)]).circle(1,mode='s').finalize().extrude(36))