Is the
chandelier is always visible? Does it just need to descend from the set's "ceiling" height to floor height in a safe and controlled manner, and not disappear entirely for some scenes?
I think your basic idea of using a
batten in the fly
system sounds very much workable, provided of course the
chandelier is within the (
point load) weight limits, is properly and securely suspended/attached to the
batten,
etc. I also suspect it wouldn't be too hard to keep the
batten from being visible, at least on a standard-ish fly
system, since to be useful for scenery flats
etc. the
batten travel needs to be at least as great as the visible
stage height. With the
chandelier, assuming it doesn't need to disappear entirely, you need less travel than that--just from it's hanging height to the
stage deck or floor or wherever.
I would avoid relying on the standard chain that chandeliers often use to hang them; such chains are not very sturdy, and presumably only sized so as to hold it up in a static, non-moving situation. Running a
wire rope safety cable through or alongside the chain seems like one good way of ensuring its
safety; using a rated chain could be another.
Properly bringing
power to the
chandelier, if it is required to illuminate, would require some planning and care, and frankly might be the trickiest part of the whole thing.