i built this using a cast iron frame that had been a stove pipe cutter . It used to be used for cutting and tucking the ends of stove pipe chimneys.
The stand is a peice of 2.5" steel pipe with a superdisc plow disc as a base . i made few different rollers to suit various jobs i have used it for including a 1960 Buick electra trunk floor . These have a rather unique double bead and are pretty big . The deep throat of the rollers frame works great for this.