import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,6,0))
r=w0.sketch().push([(4,-16)]).rect(52,50).push([(4,-15.5)]).rect(40,21,mode='s').reset().face(w0.sketch().arc((-10,24),(-9,33),(-10,41)).close().assemble()).finalize().extrude(-56).union(w0.workplane(offset=16/2).moveTo(-11,5).cylinder(16,5)).union(w0.sketch().push([(-11,5)]).circle(19).push([(-11.5,5.5)]).rect(37,3,mode='s').finalize().extrude(44))