M90 X-Carriage Fan Mount modificaction

Update: Added nut-traps to the fan shroud and shared stl. Original shroud designed by "goopyplastic" here: http://www.thingiverse.com/thing:151551. 20140426 NumberSix.
Update: LM12UU version of x-carriage with Fan Mount uploaded. 20140425 NumberSix.
Please Note: This a modification to a Mendel90 x-carriage designed for LM8UU bearings and T2.5 belt. 20131012 NumberSix.

An under-carriage fan mounting position has been added to the Mendel90 x-carriage. It takes a 40mm fan and incorporates M