Meet the Bramble Case: a 6-stack Raspberry Pi case for your complex DIY electronics projects. It is designed to fit 6 x Pi 4B, 3B+, 3B, 2B, or B+ boards. It also has room for your PoE HAT and has 3 x 5V fans for heat management. You can attach a 2.5″ SSD to the bottom of the case.
You can buy this case in black ice and classic wood color. A 4-stack version is also available.