Sounds like a worthwhile idea.
The lead screws that come with the "extended kit" seem ok (for acme).
You will have to make/buy some lead screw mounting plates and bearings as well as lead screw nuts.
(since the "extended kit" uses the stock components from the X1 & you won't have them)
These axial bearings fit the lead screws well:
http://www.vxb.com kit981 Thrust BallBearings-8mmx16mmx5mm