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@JS-187
Modifying frames is entirely possible and you may never have an issue but i am just saying that a good mech groupset like DA9000 wont require this and be hastle free in the long term.
Having sent frames back to cervelos for BB cracks in the past I would not be enlarging any holes with a dremel in that area if i intended to ride it for years... read Bob Parlees thoughts on additional holes in frames requiring changes in the layup.
Anyway its a great frame... I would avoid drilling unless you have the money to replace the frame in the event of a fault (because warranty wont cover you).