Tables like that are designed to use a fixture plate or plates. That is what the unusual t-slot configuration is for, mounting different sized top plates. You could make one or more plates and mount them using spacers between plate and table so you can feel the drill emerge through the bottom of the top plate. The fixture plates can be specialized to a certain task or perhaps just a pattern of drilled and tapped holes for mounting various parts for drilling. The plate can be aluminum and sacrificial. It is your table, so do what you want with it, and if you do drill it, most observers will be kind and not mention the defacing of it... 8^)