[robryk]

It's interesting to see some differences between the US-and-everyone-else and Russian part. One that was most striking to me is cabling and piping between modules: on the Russian side, the pipes go through the hatches, which complicates closing the hatches but makes the cables and pipes easier to access/repair and makes it easier to install new ones. On the other side, there are no pipes or cables going through hatches.

There's also a hatch in the deck of Unity that seems to have nothing on the other side (the one labelled Hab). Is it a place where a module will be added?

[sudhirj]

Probably stands for Habitat. I could see bunks anywhere else. I doubt the astronauts want to show living quarters. Not much privacy as it is.

[robryk]

I mean the hatch in the middle of Unity's floor. It appears to have space on the other side and is closed.

They do show living quarters in Node 2 -- there is even a video of the interior.