Hangar9 Systems recently released a modded version of the B787.
The aircraft can be downloaded here:
To install, simply drag the "B787-XE" folder into your community folder.
You can also join their discord to keep up-to-date with any news/updates to the aircraft.
They are also looking for any help (coding, testing, modeling, etc). More info on this can be found on their Discord.
N.B - You do need the default 787 for this to work.