If you cannot afford that or a metal shop fabricating it for you, I've used these on over-sized aluminum window flashing; http://www.harborfreight.com/catalogsearch/result?q=sheet+metal+seamer Not on galvanized as the coating will be removed. Just bend the exterior lip almost back to flat, then move the bend-line farther inward.
Be sure to close the ends with a easy-to-do "end dams"; to prevent all the head water from directing/running down the jambs with the wind; page 8; http://www.mtcc1170.com/images/BCRainScreen.pdf Not a real "rule" just good building design.
They built an addition on my house but did not remove the old siding to the old part so the new part is built 3" past the old part....they added step flashing against the old siding when they put the new roof on....I could keep going but it's kind of depressing.
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