A person building a new house while living in an older house asked to have new vent covers designed that are appropriately sized for modern HVAC ducting, but keep the ornate beauty and charm of the cold air return grates from their current home.
Do cats need houses? Debatable.
Does my wife want her cat to have a house? Yes.
Includes pictures of the 2-Story cozy pet house I designed for our kitty, building tips, and instructional CAD drawings download (PDF). If you’re the least bit handy, you can put one of these together.