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It not a question of if you can machine the rotors, but whether you should. Porsche says you should not.
These rotors, because of their slots and holes require a greater thickness to maintain their overall strength than a solid rotor would. Cutting them down weakens them and makes them more likely to crack or shatter. Also, a rotor is basically a heat sink and the less material you have, the less efficient it is at absorbing and dissapating the heat energy from the system. It is exactly this heat, or more appropriately, energy transfer which stops the car.
On a warped rotor, the maximum allowable runout is 0.3mm (0.118"). And the max Peak to Valley roughness is 0.006mm (0.0002"). That means you don't get many passes to get it right and still maintain the required amount of material for strength and efficiency.
The other thing will be to find a shop willing to turn them on a lathe. This is not only because of worries about lessening their strength and making them prone to cracking and shattering, but also because the slots and holes really mess up the cutting bit on the lathe in a hurry. The shop will not make a profit replacing the cutting bits so quickly, unless they charge you quite a bit extra.
I wouldn't do it. Brake rotors are a consumable item just like the pads are. Gotta pay to play.
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