I made it out of some random boxes that were on the sale shelf at Home Bargains for a quid - chopped up and re-designed, big hole saw for the cup holders, splash of watered down emulsion, Bob's your Uncle, Fanny's your Aunt
Normal seats but padded with new horsehair pads and the colour changed from that awful poo brown. Dead comfortable. Done by VWorks in Penshurst near Sevenoaks.
WOW. You amaze me. I had to study the picture long and hard before I saw your "almost invisible upholstery repair". Plumbing and Heating? It looks to me that you've missed your calling!!!!!