Just need to add my Ikea bath mats after they wash and then I have so many toys and hides to add
You need 12 grids to make the lid.
Three grids per row. You overlap three of them and cable tie them together in a line so they are rigid. Do that with all of the grids to make four separate rows of three. . Then join all the 4 rows together (or you can join them as two and two make it in two halves so you can open half the lid at a time). Then cable tie it to the back of the cage so it acts as a hinge. Because you’ve overlapped three you can make it slightly bigger than two grids of the cage wide, the front of the lid should then slightly overhang the front of the cage and rest of the front row of grids so it doesn’t fall in. You can then open and close it like a lid on a chest for example