Sorry to hear you have given up on the M3W Paul, cannot say I blame you. Thanks for pioneering the Empire Kit, a great improvement. I will miss your input on the 3 wheeler part of TM. As for building up a lightweight 3 wheeler, can I suggest you have a look here http://trikingsportscars.co.uk/. It even has a fully sorted engine that was designed to run the same way in the airflow without the need for a fan, how well engineered is that!