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Lol, I got ya! I built a plywood box and sealed in with a rubberized coating to be water tight. The pvc frame has feet that support the center of the frame that sit in the reservoir and the edge of the frame sits just above the reservoir. I can see the water level either from the sight tube built into the front face of the res or there's a slight enough gap between frame to allow me to see the water level as well.
This is really just a test run to see how it all holds up but so far so good. It took just about a month before the res needed a fill. But there's only been a cover crop running since early March and transplanted a couple clones 2 weeks ago. I put 2 more plants in this past week and when I dug down to make my hole the soil was moist all the way to the first couple inches of top soil.