import cadquery as cq
w0=cq.Workplane('YZ',origin=(-11,0,0))
r=w0.sketch().arc((77,1),(80,10),(89,14)).arc((3,84),(77,1)).assemble().finalize().extrude(-18).union(w0.workplane(offset=39/2).moveTo(-59.5,-40.5).box(77,119,39))