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.
But the pine shavings could be problematic if rain gets in there. I get away with having mine out in the rain because of the panels mentioned before, plus I build up 2-3" of deep litter under the entire brooder, so it sits up higher than the rest of the ground, so any rain or ground water drains almost immediately. Shavings tend to hold onto water, hence my suggestion that you check for and remove any wet bedding after rainfall.
