Review on Elevate your Raspberry Pi Cluster: Eau 4-Slot Stackable Case for Raspberry Pi 4 and 3B+/3/2 Model B – Clear Acrylic Case with Cooling Fan and 4 Layers Pi Rack by Stephanie Fields

Assembly was easy. Fans work well. I had two full-size Pi4s with large heatsinks, one on top and one below the board. I could still use the top heatsink. I simply used screws attaching the bottom heatsink to the top heatsink via one of the baseplates that came with this kit. Recommended to add to seller - one review had some concerns about loose screws which, like metal, can damage electronics. I had nylon screws that I used instead. If they come loose, it won't damage the electronics.