Ooooo I like that, very elegantI thought of our Intrepid Wheelwoman when I saw this. It could be gas or electric.
Click on the photos to make them larger.
Steve.
http://hymanltd.com/vehicles/5519-1904-cyklon-cyklonette-trike/
Yes Steve the basic design lends itself to a variety of motive power and it wouldn't be all that hard to build it to a smaller size for a single occupant.
The quality of the photos on that website is very very good which is a great aid to amateur mechanics and tinkerers alike