Cat Door For screen Mesh

This is a cat door I designed to clip through screen mesh on a door or window. I used the hinge made by FM. 

Installation steps
1. Install the outer frame piercing the screen mesh for the pins.
2. Clip the biggest piece, the one with the hinges. clipping the pins into the holes.
3. Pierce the screen mesh in front of the holes then put the last piece.
4. Cut the screen mesh between the door and the door frame. keep the excess mesh for better protection against flies or cut it all out for a cleaner result.

only used the hinge the rest is my own design