These vehicles are engineering training exercises and are not directly suitable for mixed vehicle traffic. They are too low and slow. A trike needs to have a seat height of at least 20" to run in traffic. That said, their value is in developing concepts and techniques that can be applied to velomobiles. The shape can be adapted for electric and human power. See the thread by "Barely Awake" in the Alternative forum. For motorcycle shells check out the sites for plans of model sailplanes.
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