Oh wow, what great answers.
Ok, I get the idea! No notch in beam! So, if y'all don't mind, here's a follow up question:
I can easily take 3 1/2 inches off the bottom of the cabinet, but that will leave the cabinet only about 1.5 inches below the beam.
Or, I can take the top and top trim off the cabinet, cut the cabinet down several inches, replace the top and trim, move the little wooden shelf holders down a bit, use a bit of wood filler, touchup paint and re-"distress". Then the cabinet will be more like 5+ inches below the beam. Do you think 1.5 inch below the beam would look too dumb or ok? If you think that would look dumb, how many inches below the beam do you think is best? Again, the beam comes down 10" from the ceiling and the cabinet is 8' tall.