I ordered two triples and one double; trimmed the tops (so that I could butt them up against each other and have a looooong cabinet); and screwed them together.  I had previously gotten an estimate to build a shorter DVD case (but the same length), but the Wayfair cabinets were MUCH less expensive.  The only reason this didn't get a 5-star is that I think it should have been a few inches taller, so that I could fit one more shelf of DVDs into each unit.