Its another solution but if you carefully make 1/16" measurements of the pieces in question, some basic sketches of the profile, then go to the place where the trim coil is sold (usually a roofing & siding place, could be a lumber yard, around here its Allied Bldg Materials, it won't be a box store). Typically the people at the counter will have the name of someone who bends trim for cash on the side. That person could custom make your parts and you could just put them up.
Then you don't have to mess with hauling the long brake, learning how to use it, buy a $60 coil of material when you need probably $10 or less of it. You should also get some color-matched nails in aluminum, it doesn't take very many.