Hi Paul. Yes I have seen the page. I am planning on using a 2.2kw water cooled spindle. Z axis range of 300mm. My rails for Z are 450mm long. I am adding 45° gusset/supports to both sides of each corner of the frame. I will be running dual ball screws on the X axis to minimize racking each with their own nema34 34HS59-5004S. Still havent decided if I'll be using the same size stepper on Z just yet or slightly smaller.

I haven't done a cad example of my design for reference. May do shortly pending work commitments.