Would this be worthy of a Reservoir Cloning Unit for plants?

That's what I'm using mine for. It works well, but take your time drilling the top. I'd recommend going backwards with the hole saw or going forward with very little pressure. I accidentally cracked one of my holes and had to repair it, which made the project more time consuming than expected. This is the video I loosely based my build on, but I used a different pvc setup than this guy so I could have 4 lines of sprayers: https://www.youtube.com/watch?v=z27lzS1l9_8

Probably