import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,15))
r=w0.sketch().push([(30,-18)]).circle(13).rect(8,2,mode='s').finalize().extrude(-31).union(w0.workplane(offset=-25/2).moveTo(-8,-29).box(40,42,25)).union(w0.sketch().segment((-42,35),(-35,35)).segment((-35,39)).arc((-34,42),(-35,45)).segment((-35,50)).segment((-42,50)).segment((-42,45)).arc((-43,42),(-42,39)).close().assemble().push([(-32.5,-40)]).rect(5,6).reset().face(w0.sketch().segment((11,28),(18,18)).segment((36,29)).segment((30,40)).close().assemble()).finalize().extrude(1))