So just to clarify things I seperated your answer as above. The Linde car utilized plastic walkways, and these were NOT doubled....correct?Yes, they are plastic.
I used metal on my DUPX 29723. I use double thickness and cut into sections to prevent warping. I also used metal on the VICX car. I solder two sections to get the correct thickness. I use clothes pins to hold the two and use silver bearing to fasten together. Yes, silver bearing works on stainless, flows like water with the provided flux. You learn lots of tricks over the years.
Bobby