If my memory serves me right - and it was 40 years ago so I'm not taking any bets - Paul Jameson, who built the original rolling chassis, was aggrieved that John Dodds was claiming it was a Merlin and vowed to build one that really was a Merlin. I remember seeing a b/w picture in a magazine showing a six wheeled chassis with, I think, a temporary seat mounted on top but after a so far brief google I haven't found anything.