Row, Row, Row Your Trike Gently Down the Street

Original and still active requirements:
The device shall be able to travel across the flat ground, like a paved road
The main source of propulsion shall come from the physical power of the person who is riding the device
The device shall utilize rowing mechanics in order to generate propulsion
The device shall be able to accommodate a person who weighs up to 300 lbs
The device shall be able to accommodate a person who is between 5’0” and 6’6”
The device shall be designed with energy efficiency considerations (aerodynamics, friction, weight)
The device shall be able to withstand the normal wear and tear that a bicycle would experience
The device shall move in the direction that the rider is facing
The device shall be able to turn without the rider needing to pause their rowing motion
The device shall have a braking system
The device shall be able to be maintained and serviced similar to a bicycle

New requirements and goals:
The device shall weigh less than 45 lbs (lower is better)
The device shall be quiet (no chain clanking or other annoying sounds)
The device shall be manufacturable - off the shelf, or easily machined parts that can be assembled in <30 min. Parts should also number <100 (included attachment parts, like bolts and screws).
The device shall be portable (can be put into a state that it easily fits inside a car or on a bike rack).
The device shall have a closed loop or other improved power transfer mechanism, not the current open loop chain.
The device shall have a similar safety profile to a standard bicycle (this includes - visibility, stability, reliability, …)