I don't know what you would have to remove from a wine cooler for conversion into an incubator, but
-the heat tape is generally applied along the back wall
-small PC fans are sometimes used to distribute the heat evenly throughout the incubator
-20 ounce bottles filled with water are used to add thermal mass to reduce the time it takes the incubator to warm back up after you open it
-I generally place my thermostat probe into my middle tub, this gives me a rough average of the temperatures throughout the incubator. I also check all of the tubs with a laser temp gun. My favorite incubator is made out of a big Igloo cooler and I have it set up so that there is only about 0.1 degree difference between one side of the cooler and the other.
I did post instructions along with pics last season for this, but it seems to have been moved, or pulled because I can no longer find the post. If I get a chance to dig around in my old PC I will re-post the tutorial (hopefully, this time the information won't be pulled).