Bending the panel and accomplishing a 1 inch straight line fold or foldover would require a press brake. You'd need to find a metal fabricator to get a good one. The good ones are huge, weigh several tons, can be terribly dangerous in the wrong hands and are costly. The hand-operated ones (usually called bending brakes) are not so easy to use but will work for short pieces of metal if you have plenty of arm strength and if you can find one made of seriously heavy metal so it won't bend. Honestly avoid anything you find at Harbor Fright Tools. It might bend beer cans but that's about as far as you'll get.

~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end