pmsl offer up the window and cut it unevenly
seriously though it can be done but its FAR too much hastle! you will need to remove the strip that holds down the front of the hood and fold the new one over and screw it back down also the sides of the hood (where the material folds over and under the runner bit isnt exactly easy to fit!)
The main problem you have is with tentioning the hood as it will sag after a while and look shit