Elevated STEM RaceTrack Build

I have been working on and building a scaled down 1/4 mile race track for AP bottle rockets, solar cars, ballon cars etc. I am 75% done and hope to be finished by early next week. The goal of the track is to give kids a elevated look at the completion of their car design in action. The track is going to be 77'x16" and will be able to handle two cars at a time.