import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-30))
r=w0.workplane(offset=3/2).moveTo(-32,3.5).box(36,17,3).union(w0.sketch().segment((37,-12),(50,-12)).arc((45,-9),(39,-8)).close().assemble().finalize().extrude(61))