After playing a number of hours in game, building can be infinitely complex and incredibly simple at the same time, sometime when you place a part, other parts fly off into the distance. I also have tried many many times to figure out what the flying vehicle is for, and I have found no use at all for it, other than for flying around seeing terrain you cannot land or build on. Granted the ability to do make the entire surface of mars in a game like this would not be available, but it seems that the current map, most vehicles are nearly useless other than maybe the MML or science rover, and forklift. Which I have used with friends online to build roofs and get materials up to the second floor of buildings with the pallet cage.