Thanks for the feedback. I’m still learning Fusion 360 so the model is missing some components and the z axis rail has a mind of its own!. The philosophy behind the machine it to make a table top machine from readily available components, with the fewest parts that will fit in my small workshop. (Cost vs rigidity vs complexity). I was hoping that since the Kress spindle is relatively light and forces low I might get away with a pair of blocks. The gantry height was based on my need to cut parts on my Stepcraft (about 100 mm). The decision to use twin y axis ball screws or single again are based on cost/complexity.

I will head back to the drawing board for v2