read above topic. basically you need a longer and higher top bar and longer roller chains.
various plastics and aluminum sheets come in 5x10’ or 5x12’ sizes so it would be good for those sheet goods.
However ask yourself how often you will actually need to cut out a piece that is longer than 4’ or 8’.
if all you cut out is 3x3’ widgets then it is easier just to shift the sheet a few feet and use the centra sweet spot then trhying to fight the low tension in the corners. Yes cutting the entire sheet in one run is the holy grail, but I doubt most users ever really need to do that and there are better cnc machines for production whole sheet cutting