Direct coupled ballscrews

I bought one of the CNC ready mill frames that AmeritechCNC is
selling as surplus. Somebody posted that these were available last
fall, there were still a few left last week. It's very solid (900
lbs) considering the table only travels 10" x 8", and should be
perfect for the small parts I do and my shop space.

The machine is built with brackets for direct coupled axis motors.
Because of this, it would be difficult to use toothed pulleys and
belt reduction to drive the ballscrews.

My question: would I get good resolution (.0001") direct coupling
stepper motors to the 5 turn per inch ballscrews using a 10 step
microstepping drive? I would prefer to use steppers, I was thinking
1,200 oz/in might do it. When the factory builds their machines they
use direct coupled 15 in/lb servos, but they machine off the Turcite
lined dovetails and mount linear bearings so there's less frction.
The table & saddle are probably as heavy as a large mill-drill,
although the table is only 8" x 19 1/2" it is very stout.

Any thoughts or experiences with similiar setups?