Sounds like you just want to build a custom 3 wheeled vehicle using the Metro as the platform.
In that case, I think all work with motorcycle tires, or anything of that nature, would be completely custom and unless someone on this forum has done so, I don't know if they can be of any real help. The best advice would come from the maker of the car in that photo that you posted.
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 Trying to make the most of what God has given me.
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