VERY interesting. I like how he put the *seat* on a rearwards-extending boom, rather than putting the crank on a forward-extending one.
This is simplicity itself, and genius design, and it gives this recumbent one of the greatest unrecognized advantages that most folding bikes have: quick resizing among a variety of riders. Most folks get folding bikes to fit the specific need of a packable bike, in order to get it on a train, under a work desk, in a broom closet. The extending seatposts and stems of many folders also give the advantage of being able to quickly dial in a fit for nearly any rider, short or tall.
On many recumbents (especially SWB), resizing the bike is a chore, because if the boom moves more than an inch or so, chain links need to be removed or added. This bike's design bypasses that problem entirely.
Bravo!, and thanks for sharing the link.