B&M doesn't do full pull thoughs. They will use a separate reach envelope frame for any areas with tight clearances (for Orion, probably only where it goes under the first drop). The only actual pull through that occurs on B&Ms is they will pull the first car from one of the trains back and forth through the final brake run, station, and pre-lift drive tires to check alignment. All the brakes and drive tires are already mounted before track is put up. As for actually getting everything up and running, they're probably a lot closer than most people seem to think. There's a reason the brake run, station, and lift go up first, so they can start working on all the electrical well before track installation is complete.