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Libraio
R785 shifters, XTR display/front junction box, four port (little rectangular) junction in the downtube, internal battery inside the seat tube (seat post has too small an ID to accept the battery so it's in the seat tube with a looped zip-tie on the end to allow an unfurled clothes hanger to pull it out), XTR Di2 rear mech.
Edited to add: Wolfstooth anti-drop 50T ring and XX1 10-42 cassette, Ultegra chain.
If you duplicate this setup you will need to plug a road rear mech in instead of the XTR one in order to use the e-tube software to program the setup, otherwise it's firmly in "just works" territory.