Medium Pet Door Wall Frame

Our kitten is a year old now, and not a kitten anymore! I originally designed the [Small Pet Door Wall Frame](https://www.thingiverse.com/thing:1729360) so our cat could go from the house to the garage, where his litter box is located. Now he is too big for that little door, so I redesigned the frame for the medium Ideal Pets pet door, with a 7" x 11.5" opening.

The Ideal Pet door is a quality product with a vinyl flap and lock-out slide, and runs about $22 from many retailers. Out of the b