What they said. Measure the thickness of the eggcrate and then go to he/Lowes and get some pvc or whatever diameter will get you closest to 1”. I’m guess 1/2” cpvc on its side plus the egg rate will work well
Egg crate is simple. You can stack one piece on top the other and zip tie them together. I did like 4 pieces in my nano for correct height. Only one piece to get the right height in my 120. It was actually 6 pieces as I still had it. Heres a pic.