I can see that now through the cut-outs for the chick doors. I'll still suggest you consider putting a wire floor on it and elevating it. That keeps it dry plus you have a broody buster, a hospital to isolate in injured chickens, or a place to put a chicken or chickens you want to lock up from the others. It could have many uses.The bottom is open.
But your current course of action is also a good way to go. See if you have a problem before you solve what might be a problem. Elevating it with a wire floor might be a solution if you do have a problem
Good luck.