You forget the whole point of manned missions is to be more cost effective, have strength in the face of cosmic odds, and, of course, the very reason we exist: To prove we can do it; to do more with less; to know. When i said structural support, i mean having an exoskeleton. Cooling a block of ice to sub-zero temperatures has been done before. Simple as that. Even if it needs a freaking massive spacesuit, a mechsuit, or even a pressure ressistant forcefeild, if it take us 500 - 2000 more years to do it, WE WILL DO IT EVENTUALLY! Because we're humanity; relentless, stubborn, blind geniuses.