Exactly correct and was already the plan. I have 3 presses I use all the time and two have the same base mount. The 3rd press is similar but not the same. From a mock up I made in another board I can share one bolt hole of the 3 in the mount. So for now there will be 5 tapped holes and the 2 left exposed have enough room to fill the holes with button head screws to keep the junk out.
Something else that keeps popping up about the size and materials. This bench will have one purpose and that is to reload on. No gunsmithing, no gun cleaning, no solvents. In my case I do have another bench to better handle all that. This build is more than large enough for reloading chores.