Well I think that all that is needed is a delta configuration and a leadfooted petrolhead, no doctoring of the car needed, the Reliant club members he talked with admitted that you had to be careful with especially left turns, a weight in the left seat could make it more stable when driving single. The only doctoring done to the car was probably those outrigger wheels he added later. Reliant has a problem with the fact that the front wheel is right under the engine a more forward position would reduce the problem.