I think it must be the way such things are typically done as the two I've dealt with were exactly the same.
Nothing fixed in place, nothing labeled up, wire colours changing mid length, no user manual, let alone a wiring diagram ... ;-(
In both cases I managed to create my own diagram and with a bit of Googling, find out what some of the less obvious bits did and got them going (one was a broken wire and the other needed a new component (door entry phone or summat)).
Result. ;-)
Did yours also start with ''oh, while you are here, could you have a quick look at this ..."?
A staircase like the one Adam photographed could take a really massive lamp. The sort that extends downwards over 2 storeys and pretty much fills the space between the staircases. That could need a team of people just to lift it.
Britain has some very good glass artists experienced with lighting, perhaps your client might consider commissioning something bespoke:
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Dichroic glass used correctly can look very nice in a long drop.
If you go crystal , make sure its full lead crystal and not a cheaper alternative, full lead rainbow sparkles ages to graceful yellow, crystal glass just refracts and ages milky.
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Murano glass is used to make some spectacular modern and ,er, more traditional chandeliers.
3D LED acrylic sculpture on winches , I`m available ;-)
Tirfor time
Get an engineer to sign it off, lot of weight.
Permanently mounted winch(s) in ceiling or ceiling hung frame that gets dressed from scaffolding. Either way it has to be cleaned every so often and lamps replaced. Someat like, at domestic size
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