OK! So you have an industrial machine with a "walking foot". That's what I wondered. Many years ago my wife (an accomplished seamstress and theater costumer) stitched the interior for my C-cab delivery. By the time she was done, her 2-year-old Singer was shot. That interior cost me a new sewing machine, but it was still cheaper than paying an upholsterer. That was in 1979.

Now, 42+ years later she has 3 high-tech sewing machines, a serger, and an embroidery machine, but she won't touch my upholstery with any of those machines...