import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,14,0))
r=w0.workplane(offset=-56/2).moveTo(-16,-29.5).box(38,13,56).union(w0.sketch().segment((-17,-50),(-17,-45)).segment((-2,-45)).arc((0,-43),(2,-40)).segment((2,-33)).segment((5,-33)).arc((-28,-13),(-17,-50)).assemble().push([(10,26)]).rect(52,48).finalize().extrude(28))