Floyd, if you have not built the top yet you can make life real simple by installing the carriage bolts between your layers of MDF before assembly. The top will be very stable and not prone to movement so all that will be required are some corner blocks mounted to the table with slightly over sized holes in them and washers/ nuts to hold it down. I suggest using Nylok nuts since they will not loosen with vibration.
"Living in the D" (this means Detroit!)
"It's fine to disagree with other members as long as you respect their opinions"