Ha! I have many interests. I'm currently thinking of rehabing an old 55 gallon into a paludarium. I'm looking at a stream setup in front for the water portion, and an all-out jungle in the back including a nice background with at least one waterfall. I'm just trying to figure out the best way to go about it. I was thinking either siliconing stone/rocks/slate to the back glass, or doing the same with cork bark, but the styrofoam may be a better option.
So, when you say you're going to cover it with cement, what exactly do you mean? Are you talking actual stone cement or some sort of glue/epoxy? Also, once it's sealed, do you paint it, or paint and then seal? What sort of paint do you use?