I need a cat litter box CAD design

Job ID: 37436705

Budget: $250 – $750 AUD

I'm looking for help in designing a Traditional Covered Cat Litter Box. I just need the hood, which is to create a snug fit over a 50cm x 40cm base. No other features are necessary for the litter box design - simply the hood.
I am looking for a front opening that starts at 15cm height, and is 25cm x 25cm in size.