that design is Way over complicated, and at 44lbs it might as well be a motorcycle .
44lbs is right in the sweet spot for a bike like that...actually somewhat light considering it is a gearbox bike.
if you want technology like that then look into SRAM's hammerschmidt cranks, and there new I-9 internal hub
if I ever have the money I'd go 1x9 using it. just hope they make them so they can use trigger shifters.
Hammerschmidt is neat and all, but with it, you still have the most vulnerable part of a bike's drivetrain, the rear derailleur, hanging off the bike of your bike. Gearbox and Rohloff equiped bikes eliminate this. Hammerschmidt only gets ride of the front derailleur, only offers 2 gears, requires ISCG tabs, and emulates riding in the small ring which most bikes are designed around.
SRAM's 9 speed internally geared hub is kinda neat, but it weighs 4lbs and I don't know if it can withstand the abuse/torque generated while mountain biking as these hubs are designed for city commuting/comfort bikes.