So you would like to build your own NAS with a Raspberry Pi? The Argon EON Pi NAS Case for Raspberry Pi 4 has you covered. It has room for 4 x 2.5-inch SSD/HDDs or 2 x 3.5-inch HDDs. It has a power button with an OLED display. It also has RTC built-in for scheduled booting and shutdowns.
The ports are on one side for easier cable management. The programmable OLED display under the button displays IP address, CPU & storage status. You can get it here.