This is the treadle set up that I use in my shop that I have remodeled in my backyard. The table has a leaf that I can add that will make it a full 140" long and believe me it makes life really nice having the extra room for king size quilts.
I have different machines that I can use in the table all I have to do is pull a machine out of my wall unit I built and find the appropriate plate that fits said machine and I am in business. I can even use some of the industrials like the Singer 29 with this set up.
Billy