base
You would have to make your own base, because the smallest premade ones I know of are either 36"x36" or 39"x39". A 32"'x32" one would very small, almost to the point where it would be difficult to bend over to pick up a dropped bar of soar. The thing that determines the inside dimension from the front to the corner is the size of the door opening, since that is what alters the side dimensions, and thus the inside space.