Lu,
That design concept strikes a distressingly similar comparison to the CH-47 accessory gearbox and quill shaft setup of the earlier models. Are we reinventing the wheel as we go?
Quill shaft failures were not to be considered if you wished to fly Chinooks without developing a drinking habit.
Failure of the only drive to the accessory gearbox could lead to an interestign situation....no flight control hydraulics, utility system hydraulics, and a loss of electrical power beyond what the battery would produce.
That would have made for an interesting APU start procedure in cloud at night.