Thanks for the update.
I had considered purchasing but the price delayed my decision and I thought I could make one for close to the same price and I could ensure a quality final product.
Do you have a means to raise the temperature in the garage with a space heater or add a divider in the garage to have a warmer space?
I'm incubating in a cold basement and plan on adding a small gas space heater to the incubator room so the incubators don't have to work so hard.