This is my second porch the first proved its worth, so as the cat space expands it was a logical addion.
Used as an entrance added onto a spicy cats holding area, I attached the porch to a wooden chickencoop and the 2nd porch has been used for a double door entrance to a childs playhouse which is a kitten room. . I've had a rather spicy cat climbing up the porch walls an it held firm, provided it was put in place firmly. I was able to alter the roof top to cater to a shorter height. The only negative is that the depth is not large enough for my purpose, but I make it work.