Glue, Epoxy, Weld? Plastic repair...

If you can go to a motorcycle shop, and get the same type of fairing or side cover for free or cheap, you can use it to make goop to fix yours. Take the other piece, sand all the paint off of a big enough place to get a decent amount of shavings scraped off into a bowl. Then mix some acetone into the shavings and work it until it makes a paste. You can then use that to put your original piece back together. V out the front side a little, so you will have a place to blend and feather the goop you made up before. Have your original pieces ready to stick together before you make the goop, and I would make a fixture to hold the piece in the shape it's supposed to be in. Practice on your junk piece first to get a feel for how it's going to work. This is how you fix busted Sharks Tooth grills also! :)