import cadquery as cq
w0=cq.Workplane('YZ',origin=(-26,0,0))
w1=cq.Workplane('ZX',origin=(0,-50,0))
r=w0.workplane(offset=76/2).moveTo(17.5,-14).box(65,6,76).union(w1.workplane(offset=49/2).moveTo(0,-19.5).box(58,61,49))