I have one more option for you. Here's my PRS-505 (.doc) file. This is just a blank document with (I think) the correct dimension of PRS-505 screen. Just copy the text in there and set the font size/justification you want. You can also use the "PRS-505" style which I prefer for English (Constantia, 10.5, full justified). Then save as pdf using the Save as PDF plugins
There are better way to use Word's function like BookCreator, but this is the simplest way for me.