I am looking into various options for low-level aerial photography in order to achieve avatar scale. I contacted Southern Balloonworks to ask some specific questions. I am trying to make vertical images only. So I don’t need pan, tilt or even viewfinder capabilities. I just need for the camera to point straight down and level. I asked if they had a system to do this? How large of a ball would I need to work with a standard SLR camera? What I would need to tether the unit? If the altitude is limited by anything other than the range of the remote? What is the highest they have operated one of their units? What the FAA restrictions are? And, they are working with GPS at all?