advice on diy enclosure size and animal possibilities

[Sasha2]

Okay so Im debating with making a 4x4x2 cage. I have the materials on hand.


I dont really have anything to put in that size cage except maybe the rainbow boa(but think that would probably be a waste of space) . So Im thinking of getting either a coastal carpet or a lizard of some type for the larger cage.
It would be in a cool basement so nothing too sensitive, although I can insulate the cage, the large acrylic front will let a certain amount of heat escape.

Im thinking water dragon. I have a drain in the floor of the basement so making a large water feature that could be drained and refilled would be easy.
I dont like getting wild caught animals though and dont think anyone sells cb water dragons.
Maybe something like lacertas but dont think they would utilize the height much.

Any suggestions on animals I could research for a cage this size?