Thanks for the complements and concerns.
IF this works at all, I'm sure there is more R&D to come. OR a total "Back to the drawing board" !! LOL
I also like the total floating two shoe type design mentioned. My concern with that type is the shock that will come with each directional force reversion. The slack being controlled by the tensioner will alternate with each force reversion be it brake or traction change causing signifigant shock to drive train components. I have seen someone on this site with a two roller, two arm floating tensioner. Anyone know how that worked out, or if it is still in use ?