I’ve made these out of 12mm ply and cost me about £35 all in and about 3hrs of my time. The sloping trays can be removed or flipped over in the event I get a broody. I lined the boxes with offcuts of artificial grass. Just gotta wait until my new (much bigger) coop arrives before I can try them out
They’ve got approval from the cat!

I love that design. You are truly talented. Your cat looks just like mine. Mine is a female with a 1/4 length tail. So have you started building the cat bed yet?
)