The larger drill bits will wander that close it would be better to use the 1/2 drill bit so they dont overlap leaving enough copper around each hole to stop the drill bit from slipping and remove the rest with smaller drill bits and then finish with a dremel cutting disk. it will take time but will work thats how i did mine even though my drawing showed only small holes.
I have my pc in bits at the moment due to motherboard upgrade and i mave my 6600gt out so i can see how it fits, But i am thinking of sticking with the maze4 gpu and fitting some ram sinks. I think the cooler is just too big.
Patients is the best tip i can give you hadhacker copper is the worst to work with. keep it cool and give it plenty of wd40 to stop it gripping the drill bits.
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Folding , Folding , Folding !
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