I am designing/building a dining room table and have most of my design completed. The table is 44" wide, 72" long, 1 1/2" thick slab table. One of my biggest peeves is when the heads of the table cannot fully push their chairs in. I have looked all over and am having a hard time finding what is the maximum overhang you can extend past the supports at the heads of the table? Here is a picture of the design I am working off of. Thanks for the help!