Well, seeing as Brent posted his, I thought I'd share pics of one of mine
The second pic shows where I cut out little windows in the front, which I then cover on the inside with a piece of clear plastic. I place the thermometer/hygrometer in the incubator, then I can shine a torch through the window to view the reading on the thermometer, without having to open the lid
The thermometer and thermostat probes go in one of the incubation boxes as close to the middle as possible. This has worked for three years and still going strong
I can fit 3 to 6 clutches in there, depending on size of clutch and size of container, and I have two set up at the moment, as we also have Leopard gecko eggs incubating
Total cost approx £45