Hi. This is my first DL race, but I've run quite a few races at WDW. They do ask you to arrive at the corrals pretty early and at least at WDW, we try to get there early. You may be able to push that back some, and I defer to the DL racing vets here on that, but you don't want to push it off too much. The races are big and crowded and you want to be sure you give yourself plenty of time to get where you need to be.
I do think that you can get to the corrals via that route (at least I'm hoping so) since we are also staying at the Residence Inn by the convention center. But, I'll listen to the vets on this one as well.
So, basically, I wasn't much help, but