Or at least the guidance system. Some of you who are into "retro" electronics might appreciate this link. It tells how to build your own copy of the guidance system used in the 1960's & 70's Apollo lunar missions. This stuff was tip-top secret at the time... How far we've come!
http://starfish.osfn.org/AGCreplica/
http://starfish.osfn.org/AGCreplica/