I have just purchased an oak pedestal and legs to build a base for a table top that my wife is having made from quartz counter top material that matches our newly installed counter tops. The pedestal with the legs installed is 24-1/2″ high (above floor level). The hanger bolts protrude 1-1/2″ above the pedestal. The diameter of the pedestal is approx. 8-1/2″. The thickness of the quartz top will be approx. 1/2″-1″ and a diameter of 36″. My wife wants the table top to be approx. 28″ to 30″ above the floor. The quartz top will be glued to a piece of 3/4″ baltic birch plywood. I have not determined the proper diameter of the plywood. The total height of the table with the plywood and quartz will be approx. 26″. My question is what should I use between the pedestal and the plywood to attain the height she wants and also make the table stable and strong? Also, I don’t want to interfere with knees under the table, and what diameter do you suggest for the plywood? I would greatly appreciate any suggestions you might have to answer my questions.