Do It Yourself – Wood Cutting Involved
www.alleycat.org/ShelterGallery (has whole page of DIY projects and premade available to order)
www.alleycat.org/resources/buildan-inexpensive-cat-shelter/
www.petfinder.com/helping-pets/feral-cats/building-feral-cat-shelters/
www.christinedemerchant.com/feral-cat-shelter.html
www.instructables.com/id/Cat-House-for-the-Winter-and-for-Feral-cats/