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Usually shoulders and hips are the same width: 20-22 inches. This can be the widest part of fairing. The lowered seat height should be 27 inches. Decide if you want to lean foward or lay back on the bike and arrange the controls to fit you comfortably. A body of rotation formed from a 5:1 aspect wing profile should minimize drag. Figure in some angle of attack to gain a bit of downforce for stability at high speed. For Bonneville consider some extra rear fin area. Internal flow should be ducted to reduce drag. Look at aluminum spars and ABS skin. Once the aero package is determined, power requirements will be known so tuning and gearing can be optimized.
Sound like a great project.
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