anybody ever made a tonnuea cover?

The T-Bird cover is fiberglass.

If your up to it you could make one the same way custom speaker enclosures are made.

As seen on TV on shows like Trucks, Muscle Car and others.

Made with material like a Snuggee stretched over blocks that give it the contours then coated with resin. Once hard the body work begins with filler and lots of sanding then paint.

Or you could make a vinyl soft cover.