Great route! You will have fun!
A couple of comments...mostly related to the starting portion of your route. I took that same trail from your starting point to Yosemite Falls last year at the end of April. As we all know, last year was a very low snow year. I still get grief for my query to chick-on, which went something like this...
Me: "Hey, I am doing the north rim next week...what are the snow conditions?"
Chick-on: "Very, very, very little snow below 8000 feet"
So off we went and, well, trip report
here.The point...well a couple of points...
The 'north rim", I am told, refers to the trails east of Yosemite Falls. At least that is what chick-on and JKW keep reminding me.
More importantly, I think that you will have more snow and marshy areas to cross in July this year than we had at the end of April last year, which could make the start of the trip a bit less than fun.
Suggestions...either start at the base of Yosemite Falls...admittedly a less than fun way to start a trip, lugging your heaviest backpack up a 3000 foot climb. But at least you could take the shuttle from your parked van.
Or start on the Tioga Road at Yosemite Creek...an easy first day cruise down towards the top of Yosemite Falls. The YARTS shuttle will get you to the starting point.
Basilbop makes a good point about the rockslides trail. I have done it a few times and the damaged portions of the trail were passable without too much worry, but I would expect that the winter's storms may have caused a bunch more damage to that unmaintained old road. Its a really cool route, but I would want to know that it is passable before heading off on it.
Whatever you end up doing, be sure to check the trail conditions here as you get closer to the trip.
Also, I would add that the very short side trip on a use trail to the top of Mt Watkins is definitely worth it!