Are the necks narrow enough to fit into the ~3.2" overhang cutting area enabled by gantry shift?
I will note that my own spindle setup has increased this overhang:
without any noticeable lever effects (but I don’t push my machine hard, just using the default feeds and speeds for the most part)
(and a further modification has increased it even more)
I’ve been looking at modifying the bench my machine is on for workholding — the idea is to frame the workbench top with aluminum under the machine and at the front to add:
(rotated 180 so that the metal lip is on the surface of the bench, with a similar thickness of material all around to preserve level)