Make a wooden former to the curve you want.
Polycarbonate goes soft and floppy when heated. I don't think a domestic oven will get that hot, but try it first. If not heat it on a flat surface with a hot air gun, but be careful not to overheat one spot and bubble/burn it.
You need a clean set of safety gloves, the orange or white softer woven/knitted type. Pick up the poly carbon sheet, place over the former, clamp one edge to stop it slippling, and then rub with the gloved hand to make it take the form you want. It will cool to firmness quickly.
Best way is to cut it oversized and then trim with a fretsaw or fine band saw. You can then plane the rough edge by dragging a modelling/Stanley knife blade down the edge (see fig).
Sorry if I am insulting your knowledge of trimming plastics.