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@jaap that's really useful, thanks. First glance at that chart tells me that there is something funny about the ST-S705R alfine lever. The #3 note seems to indicate that it also needs an MTB type shifter and gear indicator to operate. This is what I was looking to avoid as I don't want the bar clutter.
Let me look a bit more and propose a shopping list.
The build is . . . a secret for now. It wont be everyones cup of tea, but should be interesting and fun.
joel_austen-
The #3 note
That's only for the MU-705 (alfine di2 motor unit), if you look at the MTB chart (with the XT rear derailleur) there is no note on the ST-S705R.
If you want a really clean setup you could go for the same build as this: http://weightweenies.starbike.com/forum/viewtopic.php?t=143555
Just use a SM-EW90-A junction under your saddle, have a long wire from your shifter and derailleur to your seat and a short wire to your seatpost battery. Maybe add a wireless unit and battery.
Jaap
Nice to see you're trying something cool with di2!
For your setup it all seems possible, I always check on this chart: http://e-tubeproject.shimano.com/pdf/en/HM-CC.3.3.0-00-EN.pdf
Of course you would need a battery, junction box (or 2) and wires to make it all work. You basically have 2 options, (1) go for the bluetooth capable option that let's you change settings through the e-tube app or (2) go for the wired windows option. The second needs a windows computer to do the initial setup and eventual changes.
The parts you'll need for each setup:
bluetooth/app:
BT-DN110 Battery
You can pick between 6 junction box combinations:
SC-M9050 + EW-WU111 + JC41
SC-M9051 + JC41
SC-MT800 + JC41
EW-RS910 + EW-WU111 + JC41
SM-EW90-A + EW-WU111
SM-EW90-B + EW-WU111
And of course wires in the correct length to connect everything up.
wired/windows:
SM-BTR2 battery
and a pick of 4 junction box combinations:
SC-M9050 + JC41
EW-RS910 + JC41
EW-RS911 + JC41
SM-EW90-A
SM-EW90-B
and again, all the needed wires.
Hope it helps!