I doubt that .020" thick flange will survive traditional (mechanical) polishing. So are we talking about chemical polishing? Maybe Electroless Nickel plating?
The R.025" corners shown in the bottom right view are not reflected in the other views. You'll have to specify if that radius goes all the way along those edges or if it's just across the top of the part.
The R.100" corners look funky on the drawing, I would want reassurance (a fixed drawing) that those corners are strictly R.100".
We can't quote because of lead time, but the above questions need to be answered. Be careful. A lot of people do not know what challenges those .020" thick flanges bring with them.