You will need 2 juice container bottles (not the soda ones as the base is not square and doesn't sit as well) to get adequate co2
in a tank of this size. Also switch one bottle out as soon as it slows down to 2 bubbles per second. Don't use quick rising yeast either.
You will also want to get rid of the air pump unless you turn it on at night. The wood block is also a good way of diffusing the co2
into the tank. But if you can get a different diffuser, that would be good also.
Those little holes for the thermostat is a great idea. I thought they were holes for a special door handle that you planned.