Building a new incubator and i have a question

I picked up a glass front mini fridge and I was wondering if you can apply the heat tape directly to the plastic inner shell of a mini fridge? Or should I mount it to melamine and then put that in the mini fridge?

You should be able to fix it right to the inside of the fridge. Mine is a full sized glass front cooler convert and I have one 12" piece that runs down one side, across the bottom, up the other side and about half way across the top (I'd meant to just have it run the sides and bottom, the top was just a little extra that I didn't bother cutting off). I have two small circulation fans mounted about 2/3 of the way up, one on each side, they're pointed down and slightly towards the rear...you may or may not need one with yours being a mini fridge. My heat probe is mounted on a shelf in front of the heat tape, about 1/4" away from the tape. Once the door closes and it stabilizes, the temp in it stays about +/- .3F inside. I also have a large tub of water in the bottom, having a water mass inside I believe helps keep the temps more stable, for me it's open because I keep the overall humidity in mine up, some people keep theirs dry and all the humidity is inside the egg boxes...I do not believe either way is right or wrong, just two different methods, just the same as some people keep their thermostat probe in an egg box.

Thank you for the reply. Yeah its a smaller one will hold about 6 clutches of eggs comfortably.