https://www.pinterest.com/pin/305963368417263611/ Some one posted this older photo. Add side doors and a tapered tail. Arcsine is really an expert and the HPV shell software at recumbents.com will work with an upright as well as a recumbent frame. I figure the shell should be a 3:1 foil with a Kamm tail. It would cover from the shoulder to just below the knees. This allows me to put a foot down, lock my wheels, and load on the rack on the front of the bus. Nothing on the market is better than a 10% reduction in drag.