Oldie and still waiting.
The idea is not new but the application serves some answers to the recent questions. Here's a modification of a fabric convertible top keeping the best aero-slope terminating into a clean fastback. The frame could be made retractable or use a rigid frame profile (as shown on the idea). There has to be removeable crossbars to reinforce the shape. The immediate cons of a soft top aero-shape would be the excessive lift to weaken the fabric materials.
The major themes are the aero-profile & relative ease of convertibility - completely open the back.
The donor truck I used may not be the best aero sample but it just looks damn cool to create more 'sport truck enthusiast' converts.
http://ecomodder.com/forum/showthrea...over-7060.html
http://ecomodder.com/forum/attachmen...p;d=1234218475
http://ecomodder.com/forum/attachmen...p;d=1234218475