Not a bad idea.
@Dank bnk
Another possibility would be switching from your idea of using coco and running a recirculating NFT setup for each tray or even ebb and flow would work better than trying to get a system balanced enough to deliver drips/floods evenly to a whole lot of plants.
Are those trays 8x4?
Considered setting a drip system for each of the trays?
house a reservoir underneath each that are all interconnected so you only ever have to fill one res and it fills all the others?
then have runoff collection going to its exit?
You may get some good ideas watching some PA HYDROPONICS on YouTube.
If this was me, I would setup each tray individually with its own res and pumps etc maybe like I mentioned with the interconnected reservoirs?