Small-f freebeard, I'm not that important.
What's the current Guiness record? I really don't follow them.
Generally, with sanctioning bodies, the rules determine what can and can be done. Of course, the most unbounded would be your inspiration — Bonneville. You could look into whether you can pass scrutineering there.
You might review the materials at
http://ecomodder.com/forum/showthrea...html#post87799. I don't car to dig through it myself, but generally a free body in ground effect can have a Cd of 0.05-0.09. See also
http://ecomodder.com/forum/showthrea...tml#post289064
Once you add fully spatted wheels (three or four) it's hard to reach 0.12. When you figure in the open front A-arms it goes north of that. You might send a Personal Message to
aerohead and invite his comment. I think he would like to see it.
That other thought was unpremeditated. If the top of the kingpin passed through the upper Heim joint or whatever to a sprocket, then a chain running in the hollow upper A-arm would allow eliminating the drag from the steering arms and the drag link/idler arms (or whtvr). Those small round tubes probably have as much drag as the A-arms which are thicker but have a better fineness ratio.