Here's my 520 rigged for commuting.
Rigged a double stem for my handlebar bag to keep clutter off the top of my bars. Might put some aero bars on there for a longer tour next year.
Missing is the front rack, which I took off earlier this summer when I started using it for commuting and utility. Still need to do the following: swap cheapo plastic fenders for some SS, swap original Trek rear rack for something more substantial and lower (my large Ortliebs ride really high on the existing rack), and change out the rings and crank for something much lower....