import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-19))
w1=cq.Workplane('ZX',origin=(0,1,0))
r=w0.workplane(offset=-12/2).moveTo(9.5,15).box(7,44,12).union(w0.workplane(offset=69/2).moveTo(-29,-9).cylinder(69,7)).union(w1.sketch().push([(-38,25)]).rect(24,22).push([(-38.5,25)]).rect(7,4,mode='s').finalize().extrude(-38))