Need Some Custom Machined Ball Screw Advice Please

[Hobgoblin]

Im planning on using this setup for my x axis, dual 1610 screws held on bk/bf12 blocks (on adaptor plates [in green] to fit the extrusion).



The toal length of screw between the blocks i have planned for is 600mm. I also have 40mm of space from the screw side of the supported bearing to the back face of the extrusion. This gives 20 for the block, and 20 fresh air behind which is needed for mounting the adaptor block. and at the other end, from the screw side of the fixed bearing face to the back side of the extrusion i have 60mm, 34mm of which accounts for the bearing block. Therfore at that back side i have 26mm of space for mounting a pulley to the end of the shaft.

Basically if you can managed to work through that muggle of text, Im looking for a lift on how to specify exactly what i need regarding end machining.

Many thanks