On the MX Bike frames, the top tube will be done away with, and diagonal tubes added on each side, seats about where the rear coilover is mounted now. As far as the bungee cord idea, I like the weight saving idea, but the linkages involved would add complexity. I'm really looking at an airbag mounted to the bike swing arm, but I'll figure that out when I get the two frames connected. Here is a more recent drawing of the buggy, with the forks, batteries, swing arms, and golf cart drive rear axle to scale.
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