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The car magazines that used to run tests using a bicycle 5th wheel for accurate recording got poor tread mileage but no other problems were noted.
Re: welding titanium. Only 30% of homebuilt aircraft that are begun are completed, 10% by the first builder, 10% by the second, and 10% by the third. One key to getting them done is choosing a material that you just enjoy working in. Competitive lightweight structures can be built in a wide range of materials. The stiffness per pound is almost the same for steel, titanium, aluminum, and wood, and toughness is often more important than strength. J.E. Gordon's books sort this all out with peerless prose.
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There is no excuse for a land vehicle to weigh more than its average payload.
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