This is what the finished pens will look like...

Maybe not exactly like these, but not far off. These are the current modern indoors pens.

Here you can see inside the indoor part of the pen, with a heated tiled floor, a cat genie (replacing the need for a litter tray in many instances), to the right of the picture is a plastic table and 'fort' where the cats have their bedding, below this is there food and water. At the back, to the right is another small bed they can use, and a couple of toys on the floor. To the top left is the door to the outside section of the pens, accessible for the cats through a cat flap 24/7.

Here is a better view of the back of the pen with exit door to the outside area. You can see some more furniture and a better view of the furniture which is the same as the items inside the pen...

This is the pens from the outside, where you can see the run of outdoor areas, side-by-side. The mesh at the back of the pens is completely open and exposed to the elements. Obviously the cats rarely go out there in bad weather, but it does mean they can get fresh air and 'see' the outside world when they want too rather than having to wait to be 'let out'.

You have admit the pens are really nice, the cats have a safe, warm, indoor area and then an airy outdoor area if they want it.