Surface machining advice

[Julian M]

Hello everyone, i have attached a part that i am currently working on, i was wondering if someone could offer me some advice on the best way to machine the outside face, that is, the view where the ribs are. I would like to achieve a nice finish on the whole of this area especially the angled faces.

Also just out of interest is there an easy way to prevent mastercam machining the 1.5mm rads running around this part?

Thanks for any help received

JUlian