I take it you've never polished metal before?
The pics above are some polished some chrome plated. If i'm not mistaken
the steel parts are chrome, the aluminum polished. If you polished a supercharger by hand i would guess it would take around 50-60 hours to do
Best off paying for a metal finishing co. to do it.
I wouldn't polish the steel cross bars or engine mounts as they will need touch up almost dailey!
Good luck and post some pics of your work.