Good job on deciding to geld him. I know that's its not always the easiest thing to do, especially if you have others telling you that you shouldn't, but I think that he'll make an awesome gelding. He has a cute little jump, and to me he looks more like he just isn't finished developing, so he isn't filled out yet, nor does he have a lot of muscling going on. His butt does look a little bit flatter that I'd like to see, but not bad, and I love how much bone he has. His neck looks well placed, and connects to his body pretty nicely. I would love to see him as he grows and fills out more as he gets older. He looks cute over fences, I think that he might make a cute hunter, but I'd wait until he fills out more and grows more before deciding exactly where you want to head him. The basics of training should be the same anyways no matter where you decide to head him, so focus on that first, and see how he moves, and responds as you put more work into him, and then decide, or heck, do both lol.