import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,50,0))
w1=cq.Workplane('ZX',origin=(0,29,0))
r=w0.workplane(offset=-150/2).moveTo(8.5,0).box(139,186,150).union(w0.workplane(offset=50/2).moveTo(9,1).cylinder(50,6)).union(w1.sketch().segment((-91,-70),(-35,-70)).arc((91,11),(-52,57)).segment((-91,57)).close().assemble().push([(-29,-7)]).circle(20,mode='s').finalize().extrude(-114))