Using a metal cutting burr with a router...?

[noyloj]

Warco WM14 you can usually get away without having to machine the underside of the table.

Warco WM16 is borderline some clear, some don't.

So maybe no machining needed...

....wouldn't it be simpler/safer if necessary to mill the groove in the saddle and drop the x axis screw supports by slotting the mounting holes to get upwards/ downwards clearance? Or is this not possible for some reason I can't see. (I'm working off a plan at the moment my mill should be here next week according to Warco.)

Perhaps simpler to remake the x axis ballscrew supports with lowered bearing housings and at the same time incorporate motor mounts or standoffs...