|Step 1: Cut a hole in the box|
First you need to get one of those small, cheap Styrofoam ice chests. I don't know what size this one is, but it says it holds 24 cans and it cost about 2 bucks. Using a sharp knife cut a hole in one of the short ends of the ice chest. Cut the smallest hole you think your cat can fit through. I would recommend starting out with a hole you think is too small because you can always enlarge it later. The smaller the hole, the less cold air will be leaking in.
|Step 2: Add a door flap|
|Step 3: Glue on the lid and flip the box over.|
|Step 4: Set in a sheltered place|
I've seen similar ideas for colder climates that involved encasing a Styrofoam cooler inside a large plastic tub with a lid and packing straw (for insulation) between the two boxes. Cut a hole through both boxes to make a doorway and you're all set.
Hope this helps somebody!
PS: I am up to 58 blocks out of 72 done on the Ocean Waves quilt!!