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Finite element analysis, carrying over the load to the other side or other parts of the vehicle, designed crumple zones , ...
These things are not within reach of the hobbyist or barn manufacturer.[/QUOTE]
I disagree with that statement. There are FEA programs within the price range a hobbyist could afford, but a lot of the design work is actually readily available. An engineer might be able to tell you how to build it with the least amount of materials, but an intelligent and thoughtful builder can have access to the same information. Crumple zones, framing and structures that will direct impact forces around occupants rather than through them, energy absorbing restraint systems and the like are not difficult concepts for someone with the intelligence and inclination to utilize them.
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