After building one 6 Cube Bookshelf (http://ana-white.com/2010/07/well-i-did-promise-you-i-would-work-on.html) so my wife would have somewhere to store toys for the kids, I decided to modify the plan to use in our bedroom.
I chose to put doors on it, and learned quite a bit. Rather than 6 standard cubes, I went with a single divider on each shelf. The back and the doors are both made from some Bead Board trim packages that I found for about $12 at my local big-box.
I added a 16" wide board on the top to create the look I wanted.
I also want to note that when you're working alone, some right-angle clamps are lifesavers! Makes it a lot easier to keep square and hold things together while you drill and screw everything together.
I chose some hardware that came close to what we already had in our bedroom. The hinges took me 4 different trips to get right (first was wrong type (did not want self-closing), second was wrong depth, third was wrong color).
Overall I'm very happy with it and so is my wife. We replaced a piece of furniture that was twice as wide and it's amazing how nice it is to not have to walk around it when walking through our bedroom.