What proprietary production methods ...?? All the necessary details worthy of spying are in the patent.

If the NDA applies, its to other things he wish to patent, not the updates he should be showing to backers.

I've seen the accessories picture ( just one picture), there is no basis of patent there for an NDA, the design is very reminiscent of the Birdy approach. VERY similar, patent wouldn't have stuck in a court challenge anyway. For all that it may be, Pacific Cycles may just challenge him for royalties instead.