Here are my free .3ds file router plans including nema motor models
http://home.insightbb.com/%7Ehoda/router.jpg
http://home.insightbb.com/~hoda/router.zip (http://home.insightbb.com/%7Ehoda/router.zip)

add gears to both ends of the left screw and right screw and put a belt at front and back of table to keep the scews aligned not 2 steppers to try to keep in sync.

LOVE THE PLANS!!!!!!!!!!