== You'll have to dismantle == it extensively... but you can use '''popsicle sticks and/or a small ball-peen hammer (for shaping the curve), soft mallets & pine blocks''' to work the metal. You may have to use c-clamps to hold it steady, and to hold down make a backing block of pine or other soft wood.
''Be careful not to overwork or stretch'' the aluminum, you can make wrinkles or cause brittle tears if you do.
Good Luck,
N.