It's a whole lot more work but Masonite might do ya. You can wet an 8-inch run across the measured piece where you want the bend ... put it on a table and secure it with some weights ... have the wetted area running along the edge of the table ... then put some weights on the end that's hanging over the table -- keep wetting it down and adding weight (gradually) until you have the bend you want and then let it dry. This will take hours.
Carpeting is usually used to cover this back area ... have you considered that?
Hey, Tom ... what kind of prices are to be considered decent for the 1/8" ABS? I've got some ideas for that stuff and will soon be wanting to experiment. You can shape it with a heat gun, right?
