This is similar to my design which gets slightly updated every year. Things I did different ...
I did not drill anything. All wiring went through the drain hole.
I did not totally seal the drain hole. I wanted it to breathe a little bit.
I found that I did not need the fan.
Temp probe is mounted centered on the lid.
I began to distrust the plastic the water bottles are made of, especially when they are laid on their sides, and replaced them with sealed egg boxes filled with water. A water bottle leak would not work out well for me.
This is probably the last year for my current incubator. For next season I am probably going to have to convert a closet.
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