Hi
I thought i would post a few photos for anybody considering building an outdoor enclosure! We spent roughly $750 on this (including everything that is inside of it) and i think it is worth every dollar. The cats absolutely love it, and it is awesome that they can still enjoy the great outdoors in a safe manner.
Basically in the beginning we bought one of those DIY kits that include everything and all you have to do is put it together. We found the netting to be a little lightweight and was too easily blown up in the wind so we decided to swap it to wire mesh panels (we also don't have grass so there was no way to peg it down). All the panels were attached with cable ties and it is extremely secure and pretty much heavy enough to bolt itself to the ground. They do not have free access to this though as we rent and are not allowed to install a cat flap, though maybe in the future this may become a possibility. They do however let us know when they want to go out, by sitting at the back door meowing!
Feel free to ask away with any more questions, i am more than happy to answer
The Enclosure; Measures 3.6 meters long by 1.8 meters high and 1.8 meters wide
Inside, with play tunnel and box house to rest in on hot/sunny days
Artificial turf for part of the floor and a shelf with upright scratch post. Shelf is carpeted and post wrapped in sisal rope.
Shelf with upright scratch post
Food and water area, with automatic water dispenser