Circular interior! Neat idea! Especially if the stalls were surrounding an indoor arena, with an alley separating the arena wall from the stalls. Access to runs would also be needed, with fewer stalls to deal with.
There are many options available to someone who wants to build just a barn, but once you start adding all the other structures, it can get a bit overwhelming. Here’s where an equine architect can definitely be worth the investment. You can even ask an equine architect to help you find the ideal equine property for your needs.