Nobody is going to agree with this but let's give it a try...

You have an enormous Z axis overhang for that day when you want to cut something 8 inches thick. This is going to make for problems on every other day when you want to cut a sheet. Why not make the whole Y/Z axis assembly moveable so you can bolt it to the frame at whatever height seems appropriate?

If the Y axis linear rails were bolted to the underside of the table then the linear bearings could all sit in a neat row below the tool path where they are needed. You could condense a large floppy framework into a chunky vertical frame, put the metal where it can do the most good.

Have a nice day

Robin