Hi Bob,

Watching the bike video again made me think of a spot to use the castor geometry without having it look so "funny" and would like to try
the idea out.

A short wheelbase recumbent tandem.
Having the pedals sticking out over the front wheel looks a bit funny too, but form follows function and the pedals "out front" is common practice.

Are you willing to post the angles or degrees you have used for the bike?
Is there another term to replace rake and trail?

Did you just experiment with the angles, or use some formula?