Thor, or should that be Zeus?

[Robin Hewitt]

Just to confirm you are referring to swapping the rail and cart here on the Z Axis?

I was actually referring to the X. At the bottom you have two linear rails bolted to an enormous structure, most of which is superfluous, you only really need the bit under the gantry.
If you fit the linear blocks to the bit under the gantry and the rails to the table then the support will always be under the tool.
You lose an unnecessary overhang.