I'm not sure if this will help, but I will give it a go. For an outdoor pond, do yourself a favor and forgo the copper. It would be too damn expensive. Most home improvement stores carry basic pond basins that you would build around. Once you have a foundation for your waterfall, outdoors, I would probably go with a wood, stone, or if you are handy with metal rig to form the waterfall.
Oh, how high do you want to build this? You said about 5' wide. If it won't be that high for a "gossamer" waterfall effect, you should not need any scientifically researched lines to help form the waterfall. Just have a good pond filter/pump that you can adjust.
As for lighting I would think that any low voltage outdoor lighting with a spot type light would work to light it up from behind.
In my mind it really shouldn't cost more than $200.
Good Luck
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