Now this is a Bonneville record machine just waiting to happen: Rider in a prone tray atop this assembly, feet forward of the forks and over the ft wheel, as required to get rider's hands close enough to the bars, as well as to optimize CG. Shortened head tube with at least a Hossack if not full HCS. Nice thing about a Hossack is that the upper section can be quite narrow. Pilot would be looking at the black line basically between his feet.

Ernie