Vented top is aprox 11"x20" front panel is about 3"x20". On a previous setup I built a "rain system" I bought a pump, a couple valves and some tube. Mounted the pump in a plastic container (reservoir), ran tube to the cage. In the cage i made a oval out of the tube, drilled holes in it, flushed all the plastic bits out, and mounted it to the ceiling of the tank. I then put the pump on a timer to come on twice a day in one minute intervals. It worked however the holes in the plastic tube i used shot in strange directions or closed up. I tried PVC but the pressure was either way too much or not enough (couldn't find pvc smaller than 1/2 inch). I've seen systems like this but they are geared towards keeping plants not frogs and are way too big and too expensive, plus I'm a DIY kinda guy anyway. I also heated the water in the reservoir to 80 degrees f. I'm considering doing this again but I'd have to do better than last time. Do you know about/have you had experience with anything like that?