Simple little hook to attach a hay feeder to a big litter box.
Litter box: https://www.bunnings.com.au/paws-and-paws-61-x-45-x-25cm-grey-tray-deep-cat-litter_p0439600
Plastic Drawer: https://www.bunnings.com.au/montgomery-34-x-27-x-14cm-white-single-stackable-drawer-1-drawer_p0286345