For my wine cooler incubator, I basically removed the refrigeration unit first. Mine had a light and I just left it in working condition. As far as drilling holes, I used the existing hole in the back where the fridge control unit came through. I ran my power cord attached to flexwatt and my temp probe through this. The only extra hole I drilled was near the bottom side and ran a power cord in for a 4" CPU fan for circulation. I used 11" wide flexwatt taped to the back wall(inside of course) from near the bottom to the top of the unit. So far this unit has worked perfectly. Good luck!
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