A number of years back we were painting the interior of a high end home and the owner brought in a specialist to upholster the master bedroom and den walls. The fellow was a one man show and in his 70s, an amazing Guy. He had just returned from a year long gig working in Kuwaiti Palaces.
He measured the rooms, blind stitched the material into continuous bolts and made the custom beading. Stapled 1/4" thick foam sheets to the walls and then applied the upholstery material by stapling it around the woodwork. He used a hot glue gun to apply the beading around all the woodwork trim.
He did the job with no helper, huge rooms with 12 foot walls , and there was not a wrinkle or flaw in the any part of the application..
I asked and he told me that he was one of only about a half dozen Guys in the US that does custom wall upholstery. ... so if anyone is looking for a sideline...

Great looking result Tim!