I picked up an old Stanley #78 rabbet and bull nose combination plane at a garage sale. It works OK as a bull nose and full-width plane, but it didn’t come with the fences needed to make consistent rabbets. I made the following 3D model in Fusion 360 and printed it, this is the final tweaked version. It also requires some nuts and bolts, and I had to re-cut one of the holes in the plane body because it used some crazy non-standard thread.
Stanley #78 fence and depth stop fence model.f3