fluidity bowden 1.75mm direct drive extruder.

There are a lot of good struder designs but I couldn't find anything right for me.
My requirements were:
9mm x 4mm x 4mm thick brushless motor bearing. (http://hobbyking.com/hobbyking/store/__10201__HK_500GT_Ball_Bearing_9_x_4_x_4mm_Align_part_H60103_.html )
10mm fine pitch bowden clamp for tube for 4mm OD tube. ( http://www.robotdigg.com/product/348/Heavy-duty+push-fit+bowden+connector+4-01 )
Long direct drive 400 step per rev low voltage Nema 17. ( http://www.omc-stepperonline.com/9deg-nem