X-Carriage with Ducted Fan Shroud

X-carriage I've designed with an attached fan shroud ducted to the extruder fins and downwards towards the print surface. Rear clamp also has an extrusion to come into contact with the X endstop.

The machine I've taken the measurements from is a Sunhokey Prusa I3.

The bearings were purchased from amazon via the link below.

http://www.amazon.com/gp/product/B00OZJMX1Q?psc=1&redirect=true&ref_=oh_aui_detailpage_o05_s00

Hardware:
2x 3/16" by 4" threaded rod
2x 3/16" nut
2x 3/16" wing