How do I cut the holes in Granite (http://tanbrown.org) for my shower

I have some Slabs (http://www.VerdeUbatuba.com) of polished red Granite (http://tanbrown.org) which are 28x33 I would like to use them for a shower stall I have roughed in the plumbing and (http://maplered.com) install backer board where the Granite (http://tanbrown.org) will go now I need to cut the holes for the faucet and (http://maplered.com) showerhead. I would also like any advise on what type of grout to use or if i could just use a silicone sealant between the wall Tiles (http://www.g682.net) . I was planing on using some of the Slabs (http://www.VerdeUbatuba.com) to build a pan with a plastic liner under it but have rethought this and (http://maplered.com) I am leaning towards building a cement pan with Granite (http://tanbrown.org) gravel in it for color. Any ideas will be great. 

Thanks JR