understood what you mean, just wanted to reach the perimeter of the machine table with the tool to have access for edge drilling that is advantage at high work piece -but this is not main issue.
When I think of a standard VMC the real heavy consoled spindle house running up and down on a vertical rails with about 400 mm or more offset and the bearings stands it- it is their job.
I am using 25 mm bearings that is IMO strong enough for normal operation, however I will consider your suggestion-every detail can be important.
Perhaps it will help to support the rail side form above against the constant torque and lowering the console lever according to your suggestion