Anybody ever polish an aluminum intake manifold?

I just thought it would be kinda cool to polish the manifold in my spare time... It will be a while before I need it.

This is a typical, semi - rough casting made of aluminum. Is there a method of sanding, grinding, and polishing one of these? How? 8)

Just thinking of this, don't know if it would be practical. Otherwise, it will get paint or powder coat.

Thanks