I'm w/ Rob, there is a lot more to this than you think.
The wood underneath will just be rough cut and look like shit, it's not finish quality. There is the chance it could be painted, and maybe even look nice if you skimmed over it w/ something to fill in the cracks etc.
There will be tack strips along the back corner junction between the horizontal and vertical, and possibly sides of the steps. When you rip these out it will leave holes to fill.
Also agree that you need to plan some kind of traction, especially if you paint and coat them (it'll need a good durable paint and topcoat to avoid wear).
