I had already bought these rolling & stackable baskets from Target for my 5 kids (http://tinyurl.com/72be9cn - 2.37 Cu. In., 10.75 " H x 16.38 " W x 20.0 " L) and I knew I wanted a countertop for sorting clothes. I thought I had an idea of shelves to put these on under the counter (which would have been attached to the wall) and somehow have a space for the litter box too, but then I found the "Laundry basket dresser" here. I was so excited because this was exactly what I was looking for.
I modified the plan first by making these countertop depth, then making the base of the cabinet (at the floor) not as deep and cutting a trim shape out of the side panels so the cabinet would slide all the way back against the wall without having to remove the trim. Then, I added a 1x2 on the left side of the left cabinet and the right side of the right cabinet with the same trim cut out so I could get it against the wall on either side. I didn't want to have these sitting with gaps at the back & sides like a freestanding cabinet, but I wanted it to look built-in. Finally, the counter could sit right on top against all 3 walls only screwed to the cabinets underneath without having to be attached to the walls. So, it's a freestanding cabinet with counter.
I attached the plans I used for building this. I was able to take this to Home Depot and have all the major cuts done before even bringing it home. Then it was easy to put together. I added the curtain to cover the area where my litter box goes between the two cabinets. It would also be an excellent place for a laundry hamper.
*NOTE: One thing I've noticed is many of these laundry basket dressers have their 1x2 (that holds the baskets) align with the front (on each side). I think it looks better to push back the 1x2 1" so it's not so noticeable from the front view. That's how I did mine.