I haven't seen bricks used as a staircase on here -I've seen a pigture somewhere of bricks being used as a step between a cage and an extension, it was for an outdoor run and the bricks were very flat thin bricks it was only two levels if my memory serves me correctly. So no, I've not seen one as a staircase. I've also read that someone put bricks around the water feeders to help trim nails and that did work to cut down the trim frequency for clipping nails.
It would be a dicey thing to attempt, but if done carefully and professionally - as in there being absolutely no chance of the piggie getting injured, or the stairs collapsing, then you probably could do it with that choice of material - what railing do you think you might use for it? You'd want a railing to prevent falling accidents.
One plus I could think of for using a solid permanent brick staircase is coolness in summer. But then you'd have a cold issue in winter too. What would you line it with for cleaning? How would you clean it? If they formed a permanent staircase it would be hard to take it outside to wash it down properly...
A provocative question. Two Pro's one coolness and one nail trimming. More Con's to it at first consideration though, safety in several ways, - permanence to prevent collapse, railings, space, coldness in winter, cleaning.
I wonder - has anyone tried this and does anyone have further feedback?