C&C Building a cage on top of another cage

There are many ideas in the gallery.

Go to this link, https://www.guineapigcages.com/photos/
Type "stacked" in the search box on the left navigation menu.

For support, you can use wood.
(broken link removed)

Closet shelving also make a strong cage floor for the upper level. You can do something like this, without the ramp.
(broken link removed)

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These are three cages I've had for my guinea pigs. The last one was a 2x5 over a 2x4, The other two were 2x4's over 2x4's. I currently have a 2x5 over a 2x5 but I don't have a photo of it. It's all white.