Awesome cage and very professional for a DIY job. You should build the cages commercially and advertise them on the forum
The only constructive criticism I have is that if you are planning on using newspaper or toweling as a substrate, this is perfect, but as soon as you use sand, peat, or any other unconsolidated substrate, the grains would get into your sliding rails and cause problems.
On the next one, I suggest you add a 20mm lip at the bottom of the sliding glass to allow for some substrate.
But awesome enclosure and you are about to have a very happy pair of geckos!
"I am dying by inches from not having anybody to talk to about insects." - Charles Darwin