Machining Fixtures / Gage pins

I’ve seen a few videos of the OF running in the vertical position. Has anyone toyed with the idea of being able to “lock” the table in the vertical position and laying a part horizontally on a jig to cut tenons?
My intention would be to make the modifications to a table similar to this (among others). Would it it be best to keep the opening through the bed close to one or the other Y rail &/or close to where the Y Rail is anchored? An example of a piece to cut a tenon on would be both ends of a 4x4 cross member for a farm table.