Sturdy and Fast all Steel CNC , my first build

[ImanGH]

Hi dear
I want to design and then building a industrial CNC. the aim of design is milling Aluminum and moving axis must have
2500mm X axis - 2000mm Y axis and 600mm Z axis.
for this condition i start to design a cnc machine. this is a initial design and i have must better my design.


I have some question. please answer me.
1- because X and Y axis is long I used rotary bull nut. for this condition I design a rotary bull nut mechanism. is it important to use Super-precision angular contact ball bearings: High-speed for example 7015 or typical angular contact in good for this mechanism. It's notice that MY cnc machine is used for milling AL and i want to build it.
2-if the rotary speed of Spindle motor is 6000 rpm how design my cnc that vibration of this is minimum. how simulation I do in software? for example Harmonic response? and what the condition of analysis?
3- because i want to build this what's the important notice in design and assembly of the part?
Thank's