Filming dates have been set. According to the Huntsville Times, Space Warriors will be shot on location at the U.S. Space & Rocket Center from July 20 through August 21.
Also in the article, more details on the casting process in Huntsville, along with information on how to participate in an online casting call (for teenagers 13-18) are also mentioned.
Information on how to become an extra in the film is still pending.