He is high in the wither (makes me think he may have some Thoroughbred in him?? Perhaps an Appendix QH?)
Long pasterns but nice legs. Has a good, deep girth, though his hindquarters could do with some muscling (also makes me think TB) His shoulder angle is quite steep but overall he's a nice, solid looking horse.
I don't see how with some training he couldn't do some minor league barrels, gymkhana-type events or even some jumping.
Good shoulder. Neck is long and set on a tiny bit low. Back is sagging a little, but think it's just lack of muscling. I think a wee bit calf kneed. Girth depth good. Hind end not bad, really. I think no real outstanding problems and looks like a pretty sound horse to me.