I am not so used to this machine terminology, but cross bracing in my case are these aluminium extrusions which are joining longest (x) axis, yes?
And if i understand right i cant have middle legs because that cross brace between gantry, but that aplies only for single ballscrew on x axis. I am going to have two ballscrews on x axis driven with belts by separate motors.
The bed probably i will have several 40×40 extrusions attached to the main frame, and on those extrusions i think should be good to have sacrificial plywood or mdf.

Does that sound good?

And sorry for my terminology, i promise i will get used to that! :)

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