Straighten out the hood you have and fiberglass some braces in to hold its shape or while you have it straight make your own mold from it and make a new one.
If you choose to go with the braces(there are many ways to do this)you can make them from metal or make your own style and shape from fiberglass. If you go with the metal bracing you can use cleco's to hold the bracing in while you make sure it will work. If it doesn't remove the cleco's and move the bracing around and reapply the cleco's till it does work. Then glass the bracing in permanently.
Lots of ways to go. I think Rick mentioned one time that while you have the piece straight you can apply heat to it and that will help some. Check with him on the procedure to make sure.
Brett