I've done my own parts over the years for rc and motorbikes and a few car bits, epoxy beats polyester hands down for what you're looking to do. There's a UK company that does bike bodywork on a forum I'm on. They can do complex curves so would be guessing they can do a sheet with kick up in they're sleep.
https://www.zero-limits.co.uk/browse/1262/fairings
Hope it helps