Actually, he's not very heavily halter bred at all. The top side of both sire and dam go back to Impressive, but he's got plenty of performance blood on the bottom sides to level that out. It's hard to say much about his confo just from those 2 pictures, but he looks like a really nice horse.
He's got good muscle but he's not a disgusting bulk like most halter bred horses. He looks like he's got really good angle in his hocks and pasterns, which is another thing that halter horses generally lack. Plus, his feet look like they're a good size; virtually no chance of having Navicular issues with him (which is another plague of the typical "halter" horse).
His head is perhaps not quite as refined as a halter horse but it's still a nice head, a blue collar head, a working man's head
IMHO, he's a perfect combination. Just enough halter blood to give him some mass with a healthy dose of performance blood to correct the conformation issues that halter blood carries.
As for his non-halter bloodlines, I adore his momma's bottom side with Doc O'Lena and Two Eyed Jack. Both of them were world champion performance horses that sired countless world champion quality performance horses.
His sire's bottom side is more canted toward the pleasure classes, but those lines were back in the day when you could also successfully ride your "pleasure" bred horse in performance classes like reining and cutting too.
I see no reason why he wouldn't do pretty well in local level halter classes. I know that I'm not a judge, but if I was, I would blue a horse like yours any day over other more typical "halter" horses.