[mike mueller]

Back to Waynes original question:

A "uni-fit" flare?

Well, you have people that buy the steel GT flares because they
have to have the factory GT steel flares.
(vintage racing) so you can count that group out.

A lot of folks like the look of the GT flares so if the uni-flare looked pretty darn close,then that market might be open to you.

Some folks cannot weld or don't have access to a welder or cannot afford to pay someone to weld, so the fiberglass flares are easier for them.......one market closed.

So, yes , there will be a market for them, but not many.
I wouldn't spend my money on building them and haveing them sit on a shelf waiting for them to sell unless the profit margin was favorible.