Converting water cooler to laser cooler

Laser cooler build 1, a set on Flickr.

Some time ago a friend and I bought parts to make a 40W laser cutter. We had all the parts except a suitable cooler. Meanwhile I gained access to a commercial laser cutter and the project was shelved.
The other day I found a surplus cooler for drinking water and decided that I might as well use this to finish the project.