Its not advisable to use soil in an enclosure, soil harbors all sorts of paracites and creates a nice moist breeding ground from them. I like everything in my enclosures to either be disposable or cleanable...
But think about it because it's not really an idea you can do on the cheap or half-cocked from all I've seen.
dr del
Derek
7 adult Royals (2.5), 1.0 COS Pastel, 1.0 Enchi, 1.1 Lesser platty Royal python, 1.1 Black pastel Royal python, 0.1 Blue eyed leucistic ( Super lesser), 0.1 Piebald Royal python, 1.0 Sinaloan milk snake 1.0 crested gecko and 1 bad case of ETS. no wife, no surprise.