Multiple questions.
I'll ask the engineers for the video (I'd like to see it myself).
There is a photograph of the switch in one of the Robinson publications. If I can locate it it will be scanned. If not I'll take a pic at the end of the week. You could also ask RHC for the picture though as it is in one of their publications (which I can't remember the name of).
They are factory fitted floats not aftermarket (Mk1 with white covers not the cooler new black ones) and as far as I know single part either side.
h-we