Nope, I was building the two separate. I built one when it came out in 1998, complete version, only to take it apart later on to make the current version. That ruined parts of it, and my paint job then was a little sloppy. So, I decided to get a new one and incorporate RSM's truss work. The new one looks good.
I understand what you mean, having worked with ships. The space kit world has not been too kind to us in terms of detail and accuracy, so this was a step up compared to most space kits (if not 100% accurate itself).
The best advice is to do just that, get photos and work with them. Here is the best resource for ISS photos:
www.spaceflight.nasa.gov/gallery
Click on past Expedition and Shuttle missions. If you want more detail, try getting realspacemodels.com modules and solar array trusses.
There is not much you can do with the kit as is, in my opinion. Just paint the modules the right color (the US modules, which are the cylinders, should be silver or aluminum); the Russian modules are fairly well painted but still a bit off from the actual tan and white scheme. I also detailed my modules by painting the various portholes, docking ports and antennas the right color.
The backbone truss that holds the arrays should be kept white but it has some areas that can also be painted silver. Check out the photos. The central truss, that sits on the Destiny module, should have a silver back (the long, smooth rectangle).
I hope this helps. I don't have the model in front of me at the moment, but when I return home next week I can look some more.
-Ben
www.LaunchPhotography.com