Thanks Brian.
To be honest I initially felt a parallelogram was way in excess of my needs. I had half-baked thoughts of a wooden beam with a tripod ball mount on one end (possibly also with a decent binoc mount but not essential) and a counterwt on other end, with the centre of gravity pivitong on a vertical wooden beam. I really didn't appreciate the huge benefits of being able to lift and lower the whole assembly to different heights for different users (or same user in a different position) while still keep the object centred pretty well (until doing quite a bit of research on the web and thinking how I'd really like to be using my binocs in the field).
If you have even half decent binocs it makes them SO much more usable for some quality astronomy time
I've only realised in recent years just how many faint objects can be visible in binocs from a dark sky site. Fun to hunt them down while imaging sometimes.