import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,8))
r=w0.workplane(offset=-29/2).moveTo(6.5,5).box(31,16,29).union(w0.sketch().push([(-32,4)]).circle(18).reset().face(w0.sketch().segment((-20,0),(-18,0)).segment((-18,-1)).segment((-17,-1)).segment((-17,0)).segment((-14,0)).segment((-14,3)).segment((-17,3)).segment((-17,4)).segment((-18,4)).segment((-18,3)).segment((-20,3)).close().assemble(),mode='s').push([(6,0.5)]).rect(38,9).reset().face(w0.sketch().arc((-2,-7),(-6,-27),(6,-10)).arc((2,-9),(-2,-7)).assemble()).push([(-2,-18)]).circle(7,mode='s').finalize().extrude(1)).union(w0.sketch().segment((39,24),(42,24)).arc((44,22),(47,24)).segment((50,24)).segment((50,26)).segment((47,26)).arc((44,28),(42,26)).segment((39,26)).close().assemble().finalize().extrude(12))