I have an empty cage right now, it used to have a jacksons chameleon in it, but he passed a few weeks ago

. I have decided to put my gargoyle gecko in it, along with another(I will get another female). The cage is 3 feet long x 18 inches deep x 4 feet tall. I did the math

and found that the cage is roughly 150 gallons. Here are pictures of my gecko and the tank:

My dad and I built the cage out of oak. It has a waterfall, a sink for the waterfall to drain in, a plastic poster sort of thing for a background(a local company enlarges and prints pictures for posters and things on a sheet of plastic that is built like cardboard) and a cabinet underneath for supplies and a sideways drawer sort of thing for cords and timers and whatnot.

I found some branches that fell in my tree line and put them in there after I cleaned them:

Then, put some vines in:

I'm making some hides that are in two pieces to go on the background, I will silicone the bottom piece in then the top piece will hook onto the bottom, I added another layer of grout after the picture was taken and will add another layer tomorrow, then seal it:

That's all I have for now, I will update as I get things done, but I have one question, should I add my gecko, then get the new one(when I got to the next reptile show in the summer) and quarantine it, then add it. Or should I wait until i get the new one and its quarantined, then add them both?