Hi Joey,
I thought I should give you a visual of what I meant by cage dimensions in my reply to your e-mail. Easier for me to post a picture here so I'll just post it. I'll answer your questions in another e-mail.
The cage in this picture is 49.5" long, 20" deep, and 27.5" tall.
The upper and lower lips that the glass track runs on are 6" each. They rest directly on the top and bottom of the cage which are both 3/4" thick, effectively making them 6 & 3/4" tall.
Since the cage is 27.5" tall the window opening, not including the thickness of the glass track, is now 14" tall.
Since this cage is for a Bearded Dragon taller upper and lower lips are required. The bottom lip due to all the substrate the dragon digs into the track, the upper lip to hide all the lights and heating elements necessary for a Bearded Dragon.
For a leopard gecko you could use 4" (or 4 & 3/4"
upper and lower lips making a shorter cage acceptable.
But my point in all this is to show you that a cage with a really short window opening can look a bit awkward. Since you plan to build a nice stained-wood display cage I think your window opening should be a minimum of 14".
With the original height of 18" you listed the window opening could have been as little as 8.5" or even less if you factor in the height of the glass track.
Okay, I'm rambling. Here's the picture. Again, the dimensions of this cage are 49.5" x 20" x 27.5" with 6.75" upper and low lips. Will e-mail separately.
