Usually if I have a fairly small space station I just fly it from kerbin orbit to mun or minmus but anything larger I assemble around the desired planets orbit. Atm I am constructing a large space plane around the orbit of kerbin at around 2,500km I would say its around 500ft long and is sturdy and does not wobbly one bit and looks like something out of battlestar Galactica but has taken me ages like 10 hours to get all pieces up there.