So we were having a litter training issues (getting a little better) and I have small kitten litter boxes in the house in corners, but our one girl poops next to them or in the "corner" that putting them in the corner makes... its like you fix one corner and it makes 2 more potential corners.

Anyway, husband wants to make corner litter boxes because we felt that $15/ea was too expensive.

Has anyone made their own corner boxes? How well did they work out, what materials did you  use? 

Thanks!