I didn't see your original post, I am guessing you want us to critique his conformation? Is barrel racing what you want to use him for? Keep in mind that he is an older horse and if you are planning on purchasing him for a high impact riding, like barrel racing, besure to get a vet or chiropractor to examine him before you pay for him.
If barrel racing is what your plans are for him, he most likely will not have the capability to turn sharp and quick. He has a very long back, that is sunken with no muscle. Of course you can build up his back muscles, but you can not do anything to make it shorter.
From the pictures provided, he appears to have decent looking legs (no inflammation, scars, ect.) But as already said, his hind legs are out a little, which will also affect his stopping and turning, unfortunately. He also has a decently sized hoof, which helps keep him sound.
Small hooved horses = bad performance.