McBroom is great from what I hear. There are other who are great too I'm sure. McBroom was guiding wilderness blacktails as far back as late 80s and probably further out of little North Fork.
I want to reiterate that I made my comment only to say it can definitely be done on your own. I personally have never hired a guide or outfitter and my dad wouldn't even consider it on this hunt or a PIW NV deer tag he had 15 years ago. He would rather hunt our way and eat the tag. We have no problem with people who do, nor would we look down on them in any way. Just not our thing. So it didnt give me pause to recommend to the OP to go for it. Plus it sounded like they had been researching and he didnt ask for guide recommendations etc..
Now that said. I cannot overstate the need to have a plan for retrieval. It is a huge chore when it goes well in cooler climates to get an elk out. It is a nightmare when things go bad. And this is a very warm weather hunt. You need 3 or 4 willing and able packers on hand IMO. That's not to say 2 or even 1 guy cant get an elk handled on this hunt if things go well.
The elk use some burns there. No shade and not much to hang quarters from so if you kill him in the morning your first priority is to get it to a place to cool. Could be a long pack for quarters just to hang them in the shade to get them cool then a long pack to the truck. Elk often dont just drop where you shoot them so that could put them much farther from the truck or a cool place. Just a couple examples of how things could go against you. Highlighting IMO why more packers is better.
If the OPs party is of the opinion that a once in a lifetime hunt can only be had if the kid kills a big bull then he should look to a guide.
But if he is of the opinion that it is a once in a lifetime hunt even if they dont kill a bull and they have help on hand if they do I have specific knowledge of one herd of about 80 cows or so and for the last few years at least several bulls including 3 or 4 good to big bulls that live in an accessible area out of the wilderness, rough and nasty country but accessible. I'm willing to share it with the hope it helps the kid have a once in a lifetime hunt and maybe kill a bull too. No guarantees.
Last year there was 3 cow tagholders hunting the same herd and I dont think any of them killed elk. I think one of the guys didnt see an elk.