structure the rotor hub 101 protrudes from the roof and the main rotor 102 affixed to a drive shaft 105 which protrudes through the opening in the roof a tail boom 106 can be affixed to the structure the exhaust pipe 107 exits from another opening the steering need not be in the cockpit but can be in a lower part of the structure which can have turning power or tail rotor pedals 108 driving means or cycle pitch stick 109 and lifting power i e collective stick 110 the motor is in a motor hanger 111 where a fuel tank with a fuel tank vent 112 is located the steering compartment is enclosed by a plexiglass cover 113 it must be taken into consideration that for many years the sales of mobile homes in the united states have broken all records the structure described makes it possible to make that kind of a move in time for example there is a desperate need to fly a sattelite hospital to a disaster site or to move a field hospital to a battle site this can now be done with the structure described it is to be observed therefore that the present invention contemplates a dome shaped building structure having a perimeter 14 which is supported by a plurality of load bearing rib assemblies 15 with a bottom plate 15a said rib assemblies extend from the perimeter 14 up to and are fixedly secured to a locus common to these load bearing assemblies 15 the locus is horizontally within the perimeter and at a substantially vertical height above the ground a roof deck is fixedly.