Judged solely as a case, Thunderstorm is large. At nine inches wide, ten inches tall, and three-quarters of in inch thick, it’s not only significantly larger than an unencased iPad, but also pretty much any case we’ve tested. Made of matte black plastic, it’s also set up differently from other cases on the market. Instead of snapping onto the back of the iPad, or wrapping around its sides, ThunderStorm is more like a tray the tablet…