import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,69))
r=w0.workplane(offset=-139/2).moveTo(40.5,25.5).box(21,83,139).union(w0.sketch().arc((-63,-78),(-27,-51),(-29,-96)).arc((47,88),(-63,-78)).assemble().finalize().extrude(-36))