Customizable Delta Sliders for use with 1/2" EMT Verticals

I had put this Emmett Delta printer design aside for a while, but after someone was building this using 4x 1/2" EMT for the verticals, I decided to further the design on parts for it. The build log for this design can be found: http://www.openbuilds.com/threads/emmett-delta.5917/

This is a customizable slider that can be used with 1/2" EMT verticals using either nylon wheels or the V-Slot Wheels. This is done in openscad, so you can change a few variables to adjust it to what you need. Thi