Reddit reviews Junior Metal Loft Bed, Silver

Yeah, try a pre-assembled metal bed frame to make a second floor. Plywood sheeting from Home Depot can go on top of the bed frame to make a living surface (though you'll have to replace it periodically as they chew), or you can use sheet metal and put natural fiber rugs or fleece blankets over that (if you use blankets, binder-clip the edges so they don't shift around). You can color coordinate the blankets with some other items to make it look really nice.

Low https://www.amazon.com/dp/B07CVQXC66/

Taller https://www.amazon.com/Olee-Sleep-Heavy-Non-slip-Support/dp/B01M2D8ALO/

Extra tall https://www.amazon.com/Junior-Metal-Loft-Bed-Silver/dp/B01LZG46XP/

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For decoration ideas, here's some carrot wall decals: https://www.etsy.com/listing/398663849/

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You can put in some wall shelves to hold items like brushes, spare blankets, treat bags, etc. out of their reach

https://www.ikea.com/us/en/catalog/products/30178704/

Or use metal cabinets, such as this:

https://www.ikea.com/us/en/catalog/products/30396429/

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Many people seem to like these cat litterbox tables/benches to enclose the litterbox and store supplies:

https://www.wayfair.com/pet/pdp/archie-oscar-alfonso-kitty-litter-box-aosc1035.html?piid=30960015

Your buns will be able to chew them, but if this is a concern you can hack one with an ikea metal locker like this:

https://www.ikeahackers.net/2009/07/ikea-ps-locker-into-litter-box.html