Valve's Steam Machine may have its eyes on your living room, but it's not a console. It's still a PC at heart, so if you're curious how easy it's going to be to open one up and swap out/upgrade parts, take a look at this.
Corey Nelson is one of the lucky 300 to be testing the new hardware, and he's filmed this helpful guide to opening a Steam Machine up and removing its components.
It's...well, it's a PC, a very cramped PC, though it's interesting that there appears to be room for a second HDD in there.
Steam Machine Tear Down [YouTube]