The drawn-in rectangles indicate the material to be removed to define the pins of the joint:
and the cut through this is easily envisioned and drawn up by placing circles at each relevant point:
(using the Align tool to guide placement)
at which point the centers may be connected with a polyline:
which may then be duplicated
mirrored
and aligned:
then an array made:
and delete the extra piece:
and assign a No Offset Contour Toolpath:
