Actually this looks much easier than most of the complex systems I've seen videos on. Are the net pots touching the channel base, or are they held aloft for the roots to dangle down to the base? More commonly I see the pots surrounded in a clay medium, but I'm guessing that is different than the NFT system here. Why is it called nutrient film? Is the water stream the nutrient film?
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They're usually around 1" from the channel base...you want some room for the roots to grow and also to not interrupt the water flow. Hydroton clay balls are the common medium, you'd normally put them in the net pots to secure the plant's base as well. It's called 'nutrient film' only because it's a tiny bit of water - you're not flooding the channel.
These are all GREAT questions!