What a totally daft idea. Engineering wise think of the terrific strain on the join of the handlebars to the chassis. Wouldn't you feel a prize plonker sitting on that high back seat outside the thing. Still I suppose you could alway go inside and watch the television if you were in a traffic jam.
Thanks for posting that pacinitaly it gave us all a good laugh. I just wonder whose brainchild the design was. Where are you hiding Doc Brown?