SEBASS...the big engines are for high altitude maneuvers. It was stated the small engines on the side are for low altitude maneuvering. One step at a time. This is a great picture.
One step at a time Sebass...one step at a time. They said they were testing the stresses on the frame if I'm not mistaken. Probably will analyze the data to make sure nothing weird showed up, and then they'll begin attaching the various components(engines etc.) and test those stresses.