This is my recently installed E3d Bowden rig, which includes a servo for autoleveling purposes, and a layer fan mount.
Parts clip among them pretty tight, at least I haven't had any issues about them going loose.
Edit: Added v2, it features now compatibility with my new compact direct extruder http://www.thingiverse.com/thing:282110, (using the Bowden E3d , that means you can choose either Bowden or direct with the same mount for the hotend)
I added a 40mm fan adapter should you wish to replace the noisy 30 mm stock hotend fan.
Hope it results useful to some others !