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@JS-187
Doing it yourself does invalidate the cervelo warranty... has to be done by a mechanic at an approved cervelo dealer. This is a secondhand frame so largely irrelevant.
Also the E wire port behind the ICS 3 openings was designed for power meter cables of a smaller diameter than the di2 plug that needs a large hole. The frame can cope with it as i have seen it done a number of times. This leaves the battery issue and control box. The massive enlargement of the cable hole below the bb is not in the cervelo instructions and thats the one that scares me... lots of torsional force going through an area you are removing material from... doesn't seem wise on a 2k plus frame. Bottle cage hole placement on the s2 and 3 are low and close which can force you to lose a bottle if you use it with this frame. Chain-stays are tight on the original s3 (documented issued with zipps and other wide rims) so i would avoid zipties to chainstay to mount the battery.
OP asked for advice- Di2 is very nice but all reports are that DA 9000 shifts so well it doesn't matter. Most peoples 'advice' would be fit the group the frame was designed for rather than forcing a square peg in to a round hole... or plump for the new di2 / mechanical designed S3 available in December.