I built a bearded dragon cage with almost those exact same dimensions. It was longer (49.5"
due to the thickness of the side pieces and just a bit wider. Height was 24".
The 49.5" length is key as it allowed me to fit a full 48" flourescent light fixture into my false ceiling. More on that later.
I used some birch-laminated plywood I had leftover from another project. It was stained and coated with three coats of Polycrylic polyurethane. The floor was covered with a scrap piece of vinyl flooring.
The cage has a solid top which allows me to set things on top, etc., but I still have the entire top ventilated. I did that via my false ceiling design. In other words, there is a 6" x 48" gap all along the back top of the cage. Below that is a pine frame covered with screen.
This allows for an attractive, escape proof cage with easy access to the lights.
Here's a pic of the bearded cage. I'll post a picture of the false ceiling design next.
