In order to do a full table you need to take into account the spacing between the aluminum Slats AKA T slots. Nothing here is really a perfect spacing as the layout is not a perfect one for completely even spacing from one slat to another. Here is the DXF file that takes into account the spacing of all of the slats.Single Spoilboard Slat
Just butt the next slat together until you have 12 
Some Images of my table This includes M6 threaded inserts. I also used Delrin 3/4 inch rod to but fixtures against instead of using angled wood, which allows easy corner access to zero out your part. here are some images