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There are national standards for manufacturers whether FMVSS for running gear or EPA for engine emissions. Test data has to be submitted to the gov't for approval before sale to the public. A custom vehicle you build for yourself or very limited production usually falls under state licensing laws. The state may require you to use certain approved components. A state inspector will likely want to look over your vehicle before allowing it to be registered. The finished weight of a trike will depend on materials used and the design of parts for factor of safety.
The SCCA Formula Vee and Super Vee class cars would have the front suspension and frame suitable for a single seat trike. If you are not into welding a tube frame then a composite cut and fold unit made from honeycomb aluminum might be cost effective.
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