R785 + XT(R) rear derailleur is a sure thing! Just don't expect a front road derailleur to work with it.
You will need wires, a battery and a junction box with a charging port. Everything you need know is in here: e-tubeproject.shimano.com/pdf/en/HM-CC.3.3.0-00-EN.pdf
have a look at the different junction boxes.. bar end, under stem, bar top mounted....... once you figured out where you want your junction box with charging port the rest should be easy to figure out.
And do you want to use the second shifter as well? (since you don't need it for 1x)
R785 + XT(R) rear derailleur is a sure thing! Just don't expect a front road derailleur to work with it.
You will need wires, a battery and a junction box with a charging port. Everything you need know is in here: e-tubeproject.shimano.com/pdf/en/HM-CC.3.3.0-00-EN.pdf
Here is a similar build: http://weightweenies.starbike.com/forum/viewtopic.php?t=143555