Why not use the aluminum! cut it to shape, holes etc. Then scuff it with scotch brite, and prime with zinc chromate, then paint
your color. I redid a Chrysler out board hosing this way. Yrs. ago. Stripped all the old paint
off, washed it with acetone, primed with chromate. I let it sit and dry inside for about a week! Then I wiped it with a clean rag, and painted the parts
with Kryalon spray white. I sold the boat 10 yrs. later and the paint still looked like it was just done! This motor
was used strictly in salt water
, and was never covered. When I scuffed the skeg in the sand, it went down to bar metal, but the paint never pealed or blistered, at the edges of the exposed metal!