I think it looks nice. I love the color idea, nice and bright.
The only thing I can see that might be a problem is the indoor siding.
It might not not sturdy enough if you have a determined kicker, but you can always put lumber over it later, if it is not holding up.
Nice lumber, and I like the way you didn't skimp and made the walls in between the stalls double, you will be happy you did that.
I like it, I am looking forward to seeing the finished product.
The best time to plant a tree was 20 years ago, the second best time is today.