Robo3D X carriage bracket and fan duct

EDIT: please see the newer revised edition here that is suitable for the Hexagon hotend. http://www.thingiverse.com/thing:431160

During my 3D printing learning curve I found the requirement for ducted fan to achieve better prints and to successfully bridge. Since the Robo3D there wasn't any suitable fan ducts available on Thingiverse so I decided to try my hand at 3D CAD and design one, needless to say yet another steep learning curve.
This is my first design and I wanted to share it as