I'm not an expert and different resins might be easier than others, but I think this might work for you. Cut two pieces of sponge to fit the cowl, one for above and one for below. Soak them in hot water and sandwich them on the cowl with some tongs, let it transfer the heat to the body for a few seconds and see if it becomes pliable enough to bend. Didn't work, try hotter water or holding it longer. No guarantees this will work, but worth a try. If this idea does work, I would use the firewall or a similar shape to push the cowl up. You want to push the whole area in one shot to prevent waves in the panel.