I sure wish I'd learned more about seat upholstery from my father before he passed. I remember back when he first set up his upholstery shop we were pretty well dead broke. To bring in some extra cash he started selling high-quality repro seat covers, branching into Ebay a couple years later in 97/98. Sold a bunch of covers and reupholstered a lot of saddles, mainly for 60's-70's Honda CBs.
He always did a bunch of the same tricks the guy in this video is using. An electric bread slicer makes a pretty quick way to cut foam!
-Andy