Not Difficult.

With the biggest piece of black building foam and a budget of dollar one can take some photos attach RC Model Aircraft done at night leds 'responsibly' cause a stir. The key to success is an automated none treating space mine industry, by new kinds of laser from within the Kuiper Belt as this is just outside mars. It can be achieved with the help of an unmanned Martian moon base on Phobas.
The International Space Station can float little rocks floating them by laser this is within today’s technology. With the International Space Station building an earth orbiter in space. This may solve some of global problems facing Planet Earth today. While allowing cost efficient mining industry to be built. Some of these mini projects show how it might be possible. To have mini robots construct structures that can be formed out of carbons of dust. This can happen with very little resources as it all in place. Here as shown autonomous robots will be used to 3D print a cellular structure fit for habitation. 
In the few parts that would need to be made on Earth would be folded from a tubular module that can be transported by a rocket out of a small workshop. To ensure strength while keeping the amount of binding 'ink' to a minimum, the shell here is made up of a hollow closed cellular structure similar to foam. Xavier De Kestelier of Foster, with partners specialist modelling 'have their practice’, as are used for buildings to withstand atmospheric elements designing for extreme climates on our  Earth and exploiting the environmental benefits of using local, sustainable materials. Our lunar habitation follows a similar logic.' They say the 'hollow closed-cell structure' - reminiscent of bird bones - 'provides a good combination of strength and weight. 'The raw lunar material is turned into a pulp and sprayed to form a solid block that is then used to build walls at a rate of around two meters an hour as some day planet earth will cease to exist anyway a few goodies from this bag insignificant with in our Stars Heliosphere right.

Using varied techniques from 3D printing combining robots in action make simple large igloos’ The raw lunar material is turned into a pulp and sprayed to form a solid block that is then used to build walls at a rate of around two meters an hour. 
Blueprints for mankind's first habitable lunar base were unveiled 1-2-2013 on over coming centuries and it will be build by robots almost entirely out of 'Moon soil'. The outpost, designed by the European Space Agency, will be built using state-of-the-art 3D printing technology to transform raw lunar soil into livable domes. The ESA teamed up with architectural firm Foster + Partners in a bid to set the wheels in motion for a permanent human presence on Earth's only natural satellite and experts say it could be ready for humans to move in within the next 40 years. 

Having an I.s.s. as big as a small state should be achieve-able with remodeling design. The ESA's human spaceflight team's Scott Hovland said: '3D printing offers a potential means of facilitating bace settlements with reduced logistics from Earth similar only polar bases' The theory is that 90 per cent of the materials needed to build the structure already exists on the Moon, so only the robots and light-weight parts, such as inflatable’s and the solid connector and entry segments, will have to be ferried from Earth. Ambitious: The ESA teamed up with architectural firm Foster + Partners in a bid to set the wheels in motion for a permanent human presence on Earth's only natural satellite. Moon brick: Simulated lunar soil has been used to create a 1.5 tonne mock-up and 3D printing tests have been undertaken at a smaller scale in a vacuum chamber to echo lunar conditions.