16 gear carryme looks nice. But probably a lot of work building the freehub adapter. The guy could have used a bigger jump between the front chainrings for wider gear range. I have a 20T jump on my Dahon.

It would be better if there was some kind of chain/cassette guard at the rear over the freehub, so that when the bike is folded, the protruding cassette doesn't bump into stuff.