Building anything can be a complicated task.
Building big doesn’t always make it easier.
Building big in space definitely makes it more complex.
USAToday has a dandy flash presentation on the 10+ year construction effort to build the International Space Station. Starting from nothing in 1998, the station components get aded in sequence and position as the flash progresses. There are links on the right to each component as it’s added.
Check it out at: http://i.usatoday.net/tech/graphics/iss_timeline/flash.htm
ISS Comes Together