If you are going to use any kind of fencing material, I STRONGLY URGE you to install welded wire fencing with no more than 2 x 2 openings. I've had kittens even a few months old squeeze through the 2 x 4 welded wire holes. I've also had kittens squeeze under a closed door with a max of a couple inches between the bottom of the door and the flooring.
Install that wire on the INSIDE, not outside the chain link.
Also recommend a high gloss, non-toxic paint for any exposed wood. You will be replacing it in a hurry if it is not sealed well. You will also be replacing any carpeting within the year.
Enclosures are great for adults, but not really a very good set up for young kittens. The best scenario is a spare room. Kittens climb, kittens fall, queens carry kittens to shelves which is extremely dangerous to their well being. No one set up is ideal for everyone, but we built ours to be 3 x 3 x 6, two high. This is big enough that the queen has room to move around, stretch, a litter box well away from elevated food/water bowls and birthing box. We used PVC and either 1 x 2 or 2 x 2 welded wire, RFP board over plywood for flooring and a zillion tie straps. I will say that the tie straps are the worst part about our queen pens for cleaning, but other than that I am really happy with them. Since this photo, we have installed bowl holders and RFP board on the top pen. Some girls like a box, others enjoy a large open rubbermaid type storage container. Whatever makes them happy.
