Cool set up and will give it a try.

I live in BC and i have looked every where for the round plugs you are using for the lid.

What I ended up doing is cutting the holes at 1 1/2 inches and then used a thin pieces of hard foam and cut it into a circle and the put a split 3/4 way down to hold clone stem.

Well when I attempted this last time I could not get them clones to grow past 3 weeks and they would die. I thought it was because of the slit, but now i see yours up close, It can not be.

I am going to make mine same as yours and give it another go, I have lots of clones to test with.

I will keep my eye on your post and good growing.

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Sully