import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-24))
r=w0.workplane(offset=15/2).moveTo(0,34).box(100,24,15).union(w0.sketch().arc((-15,-39),(32,-30),(13,15)).arc((10,25),(1,31)).arc((-5,25),(-11,21)).arc((7,-10),(-15,-39)).assemble().finalize().extrude(48))