That Bar looks thick, so my guess is it will do the job. Still needs to be attached to the chain stay on the other end though.
I think the Nuvinci is a very atractive gearing solution, we should give it a chance ,,,it is one of those elegant solutions to the old challenge of how to gear things right for the engine to perform.
I was thinking about the Sram dual drive and the new Sram i-motion9(340%), but now I am inclining my decision towards the Nuvinci; it is more of a mental hurdle now to figure out how would it feel not having fixed gears to go by.(hey 775..a Video is needed badly!!) This thing is just so different. You could almost have two throtles. One on the right hand for the gas; and one on the left hand for the Nuvinci(350% continuos)....and keep the engine, after start rolling from a stop, always in the sweet spot of the powerband.
Reminds me of the old Indians with a throtle on the left hand for the spark advance.