Turning My Welding Table To a Fixture Table

Short vid of turning my welding table in to a fixture table. I drilled 5/8" holes on a 3x3 inch grid doing every other hole so they are essentially a 6x6 staggered grid pattern. This allows me to use inserts clamps and other fixtures when building and welding. This table I built is 3 feet x 5 feet and 1/2" thick for reference.