DIY NFT setup for my kitchen

I'm planning this NFT system for my kitchen. I live in a small apartment with high ceilings, so this is my attempt to make the best possible use of the space I have. I plan to grow all kinds of leafy greens (herbs, lettuce, spinach, pak choi…) and maybe later on even strawberries or other fruiting plants. It all depends on the compatibility within the system and my needs. FYI: I'm building this system in Germany, so all the products are from German/European vendors and all the units are metric (all measurements in the sketch are in centimeters).

Setup

The system is build in four levels, with the three top levels being rail systems mounted on planks attached to the wall. The bottom level contains the electronics and the reservoir, placed on a small platform under a table that is also mounted to the wall on one side.

The bottom two growing channels are 70 cm apart (approx. 55 cm from light to rail), and the top layer is 10 cm smaller. All layers are 80 cm wide, and the lights are 60 cm wide. The slope of the channels is about 3%.

Products

Lights: Caluma LED Stripes, 18 W, Bloom, 3000 K

Reservoir: Eurobox 60 cm * 40 cm * 32 cm

Channels: Air duct

Water pump: Costway water pump, 900 l/h, 2,2 m max head

Questions/Feedback

• The system is in a busy area. Can I get away with not using additional ventilation?
• I want to use LEDs that emit 3000 K because I’d like to keep a cozy atmosphere in the room. I know it’s not ideal for leafy greens, but I don’t mind slower growth as long as the plants do grow.
• How many plants can I grow per channel? Is the light source powerful enough? And is the spacing between the channels and the lights sufficient?
• What’s a good way to connect the rails to each other? With the slope it’s hard to connect them straight down, and I don’t want leaks or dead water zones at the ends of the channels.
• Do I need an airstone in an NFT system?
• Are air ducts a reasonable choice for channels? I’m not a big fan of PVC, but I haven’t found a better option and I’ve seen it used in a lot of systems.

If you are wondering: Yes, I already posted this yesterday. But I'm hoping a post with a picture instead of a text is gaining more traction => more feedback.