New and in need of wisdom

[Washout]

Here's the latest iteration - changes are:

- Re-structured the Z axis to kind of match what Jonathan showed in his photos and some general tidying up in that area.

- Made the corner posts on the bed taller and moved the x axis ballscrew assembly to the same height as the rails and outboard (did the same on the other side as well to keep a dual ballscrew option open).

Still to do - add in the bearing pillow blocks, which will probably mean some changes to some areas to accomodate and anything else I am missing, once you guys have finished ripping into it