Im working on a guide pully and a spring loaded tensioner. the detale will be forth coming. I would like to use a three wheeler, but given my size right now three wheels is a must. I have looked at mass produced recombant three wheelers and none of them were built with a large person in mind, and few had suspension."OVERKILL"HAS BOTH. But as I said before SHOOT ME if i take on a project this ambitious again.