import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,-52,0))
r=w0.sketch().arc((21,25),(34,-41),(92,-7)).arc((76,54),(21,25)).assemble().finalize().extrude(16).union(w0.workplane(offset=104/2).moveTo(-77,-53.5).box(46,7,104))