From an old thread but may help out.
...here's a modification of a fabric convertible top keeping the best aero-slope terminating into a back. The frame could be made retractable or use a rigid frame profile (as shown on the idea). There has to be appropriate pre-bent crossbars to reinforce the shape. The immediate cons of a soft top aero-shape would be the excessive lift to weaken the structure & 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.
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http://ecomodder.com/forum/showthrea...over-7060.html