Re: circular stairs off of back porch
sorry for such a late reply. if your still active hear.
it can be done although if your a diy'r i wouldnt attempt it, stairs are hard enough for beginners, even seasoned carpenters have to scratch their head quite a bit to build circular stairs
it involves building a temporary wall that follows the radius of the stair and then laminating 1/2" pt plywood 4 plys then laying out the stringer itself.
alot of time and a lot of material
fire up the saw and make some dust