A sufficiently strong machine

[JAZZCNC]

It's hard enough to align 2 rails let alone four. If you really need the higher load ratings, it's easier to just use bigger rails.

I mentioned something similar to you in an email Jon and feel the machine would benefit from 1 more rail on both Y & Z axis. One Higher up on Y axis and on 3 sides of box on Z axis but more to help with resonance and vibration in all cutting directions rather than increase load ratings.?

Would also add another ballscrew to Y axis rather than increase bearing plates has the action of 2 screws pushing/pulling together would be smoother than widening the plates.?

Like you say it's very strong already but feel these changes would make it the close to ULTIMATE strong machine.!