One way Cat litter box door + Upper opening + Clip

Big litter box door, my cat is fat and does not fit in the litter box so i making bigggg one from two storage boxes :D 
 

Bolts and Nuts:

M4 x 20mm - x4 

M4 Thin Hexagon Nuts - x4

M3.5 x 16mm - x16

M3.5 Thin Hexagon Nuts - x4

 Also added plain door if you want to put some different picture or some words on them :)

🐈 Added Top Box Hole Frame 🐈
 

🐈 Added Box clip 🐈

                         I used two Wham Crystal Box 102L storage boxes. 
❗❗❗ For different boxes you will need to make your own clip design ❗❗❗ 
https://www.amazon.co.uk/Wham-Pack-Crystal-102L-Clear/dp/B0B5VMDX25