DIY heated igloo for stray and feral cats - How to make a heated igloo for cats - Cuckoo4Design
Build a simple outdoors cat house from insulation board and a plastic storage box
Outdoor feral cat shelter, great for outdoor kitties! http://thefurrybambinos.com/daddy/how-to-build-a-simple-outdoor-cat-shelter
Insulated cat house with heated cat house option.
Inspired Outdoor Cat Shelters by Architects for Animals Kitty Condo by RNL
Make an outdoor cat shelter for stray cats in your neighborhood! More info: http://www.indyferal.org/Literature/out_cat_shelter.pdf
Frugal and Homemade Winter House for Stray Cats - A cheap way to provide outdoor cats with a warm house.
How to care for outdoor cats and barn cats (set-ups and supplies) | Shelter Me, Inc
The Very Best Cats: How to Make a Winter Shelter for an Outdoor Cat
Build a Cozy Low-Cost Cat Shelter for Outdoor Cats