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Yes, your assessment is correct. I was looking at these:

http://www.sdp-si.com/eStore/Catalog/PartNumber/A%206A51M074NF0608

The pitch diameter is around 47 mm.

It just occurred to me that I could drop the pulleys and idlers "below" the horizontal frame members. The frame is the "standard" 20x20.

What I was trying to do was avoid the lead screw machining. Open Builds sells 1000mm long lead screw. I was thinking about using a stop collar above the bottom plate with some form of bearing.

I believe the final length of my leads screws will be in the neighborhood of 650mm. I do have some concerns about the rotational inertia involved but on the other hand, I don't have a solid feel for these steppers and what they are capable of swinging.