I have a drop table section in my table (less than full size.)
The beam can operate out over air for a few inches on the unistruts, and the shelf can be removed for that area to be completely open to the ground for large items (I have never used it for that.) I do use the shelf area frequently for laser projects and a rotary axis (laser).
You are still limited in the depth you can cut. If you use a 2 inch end mill, you’d need to be able to raise the spindle > 4 inches or you’d drag it across your workpiece. But for inlay work on the top of a workpiece, the drop table would be perfect.