best way to cut that white sheeting for shelving

I have made a few built in cupboards and it took a while to cut all the material up. Ideally instead of a circular saw with a good blade, square, straight edge and clamps is there another way of cutting the stuff on site? I have a portable makita table saw, a compound slide mitre saw, but both make it very awkward to cut a sheet 495mm wide and 3.6m long!
Would a radial arm saw be best? I have a big shed and have the room, and they seem reasonable on flea bay in price. Or do I just order it all from a kitchen maker cut to size. I am talking about 6 walk in robes to fit out.


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