Brendan, Thanks for the very pertinent comments.
Yep, the first photo shows a rather crowded EQ6, although I must admit that was worst case, including still having my original 80mm guidescope piggybacked on the WO. If I'd have tried to piggyback them on the C8, it would have looked really impressive! Until it all fell over
So my real accomplishment (for me) has been to reduce the total mounted weight by elimination of the two refractors, remove the need for the 80mm guidescope thanks to yours and others posts on finderguiders, fix the balance problem and still have an easily-mountable setup for my three scopes, using the LHS plate.
Since all my scopes have a top vixen rail, I can piggy back easily-removable lightweight things there, such as widefield cameras, etc, while still having the guiding via the lightweight finderguider sitting fixed on the RHS panel. I suspect it's ~400g total weight would hardly cause any SBS flexure problems there, especially with the main scope over the EQ6 axis.
Anyway, it looks much neater, far more accessible, is easily balanced, guides well, and accomodates all my scopes. What more can I say?