Shoebox will be good for a bit, unless you have SMALL feet, and for a 24" it could still be pushin it a bit. but David is right, too big an enclosure could be a bit stressful. You need to make sure you have a good heat gradient. 86-88 on the warm side, low 80's to upper 70's on the cool side. Humidity around 50-65% on the high end when preparing to shed of course. Thats the important stuff off the top of my head.