Cheers Neale & Dean for the advice, will search around for this.
I am guessing its going to be the same case with the box section also (local supplier being cheaper than online) so will search around for this also. To confirm is it just bog standard mild steel box section or is a specific grade recommended?
With a 4mm wall the gantry box section and side plates alone weigh 20kg (no motors, no Z axis, no ball screw, no spindle, etc) will the 6.1Nm Nema 34 @ 70V with AM882 drives previously recommended handle this ok with good enough speeds for both aluminum and some wood work?