I'm going to use the basic design as drawn by John Raabe to use in our hunting cabin. I see the tread is 11 1/4 inches wide. I'm wondering how wide the cutout portion is?
http://www.countryplans.com/alt_stair/ (http://www.countryplans.com/alt_stair/)
It looks like the cut out portion should over lap the toe kick underneath it by 1.5" So it would depend on rise vs run.