I bought the DXF from MFSlab MultiFunction Slab Work Bench - Multi* Function* Slab
for $18. I customized it with an opening to hold a router plate or other use. I plan to make an insert for my Kreg Pocket hole drill, vacuum hold and a vise.
I do not route or cut MDF due to the dust. I also wanted a table that wouldn't be junk after a liquid spill, rain, glue squeeze out or paint, so I chose to put Formica on 3/4" MDO before cutting holes. MDO may look like plywood, but is not. It is the material that outdoor sign makers use.
Major lessons learned; put the MDO on the CNC properly the first time (notice extra holes on left) and test the diameter of your end mills. Picture tells full story of positioning the MDO. Even in the world of +$80 router bits do not expect you are buying NASA precision tooling. This project needs minimal clearance for a precise fit of the inserts and if your bit is 0.001" undersized, then the inserts won't fit. I already have Formica put on another piece of MDO and will cut it after more evaluation of this one.
My shop made (cobbled) router fence uses one of the holes to pivot on and a clamp to hold it in position. Has worked well for couple initial jobs.
After making the slab, I went about looking for gadgets to use on it. I bought some Bessey auto-adjust clamps from Lee Valley which are awesome. I plan to get some of the Parf dogs, wedge dogs and surface dogs.
In hindsight, I saw that Rockler carries a lot of gadgets for 3/4" holes that I would like. I would advise people to look at those offerings before making the diameter decision.