left handed deraileur is working well.
I cut the side plates from on old deraileur, fabricated another set of plates the other way round, dished the edges and welded them in place of the originals.
I still had to use a jocky wheel on the chain run to get the seat down to where I wanted it.
I am wrapped with the ride. I now know what is meant by the "recumbent grin" It stays on for a long time.