Don't get the cutouts, I guarantee you will regret it. Austin is in a T-10 with the cutout on the cool side and I supplemented the belly cable heat with a CHE for a long time but it sucked out all the humidity. I got the replacement cutout piece for the hole but it isn't perfect. I think you would be WAY better off getting a radiant heat panel for the cool side. I posted pics of my setup after I got the RHP and I wish I had done it that way from the start. I haven't had to spray my cage since I got it. They are a little pricey but SOOO worth it in the end and since you have the smaller T-3, you shouldn't need a big panel for the extra heat. Please re-consider getting the cutouts, you'll be happier you didn't in the end.