The 2-rail sweep is the right tool in v4.5 for this model. Not sure why you would resist it.
I don't normally provide example files any more because I think people learn better when they create the models themselves. However, I did prepare this file, using a 2-rail sweep. Notice that I made the sweep a little wider than the actual part so that the tool will deal with the edges gracefully. I would re-toolpath it if I were you as I didn't make any attempt to put in sensible numbers for the toolpaths.
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