Oh wow I see what you’re saying you covered up wholes with foam siding and tape so no air and humidity get too high or too low is that what you did?
I’ll see if I can find a picture. Go to Lowe’s and buy a couple sheets of 4’ x 8’ 1” foam insulation. It’s shiny aluminum on one side, white foam on the other. Maybe $15-20 a sheet. You can use a razor knife to cut it, and use aluminum tape to hold the seams together. You can easily cut vent holes, a door, whatever you need. I had a nice little thermostat controlled electric space heater and I built a little box for it that sat outside the cabinet, that way there was a little shoot so the heat didn’t hit my plants directly. I bought cheap little 120v ac fans like you see in computers, I even had volume knobs on the exhaust so I could adjust the flow in my exhaust. The entire thing cost about $200 and lots of that was the tape, I used a lot of tape. Any questions just ask but it worked perfectly. I even added a bluetooth hydro/temp monitor so I could monitor conditions from my bedroom. If I did it again I could do it cheaper and better.