I am going to build a layout table using 80-20 for the frame. The surface will be high density polyethylene instead of granite. Much cheaper and lighter and accurate enough for my purposes. I need to determine the dimensions. Measuring my bikes, it looks like 36 inch square would be an adequate size/shape but maybe I am missing something. The worst thing would be to make it too small and the second worst thing would be to make it needlessly large. What is recommended? Jerry