Impressed with your work as usual. In my "old days" I had a boyfriend had a hot rod with the same red and black colors.
I also have a couple of sewing machines that came from GW with "exploded" cases. Those cases were not designed to have a forty pound sewing machine bounce around in them. The last of my canning should be done tomorrow and perhaps I can refocus on the case repair project. I found some heavy shelf liner at Wally World that may work OK as case covering.
BTW I did some research on the Tolex fabric and may consider purchasing some. Yes, it is spendy, but is 54 to 60 inches wide. I am thinking that that 1 yard may cover 3 cases. I calculated the square inches of the case top and bottom and converted to = yardage.