This is a case for a Raspberry PI 4 nas. It is very compact and fits the PI 4, one 2.5" HDD and a 40 mm fan for cooling. You can print the spacers with TPU for dampening or buy hdd dampers to mount your hdd in the case. For mounting the PI to the case you will need four m2.5 threaded inserts and m2.5 screws. If you buy a Noctua fan you can use the rubber anti-vibration mounts otherwise just use m4 screws and nuts or other fan screws. You can wall mount the case with the wall mount bracket. Just screw the mounting bracket with two screws to your wall and slot the case on the mounting bracket.

My NAS components:

• Raspberry PI 4 (4 GB) https://www.raspberrypi.com/products/raspberry-pi-4-model-b/?variant=raspberry-pi-4-model-b-4gb
• Segate Exos 7E2000 (make shure to buy the SATA version) https://www.seagate.com/de/de/support/internal-hard-drives/enterprise-hard-drives/exos-7E2000/
• Noctua NF-A4x10 5V https://noctua.at/en/products/fan/nf-a4x10-5v
• SATA to USB 3.0 adapter (not quite happy with this one, if you can recommend one please contact me) https://www.amazon.de/Adapterkabel-SATA-externer-Konverter-Kabel/dp/B07PTPDH8N/ref=sr_1_5?__mk_de_DE=%C3%85M%C3%85%C5%BD%C3%95%C3%91&crid=324Q7FMK5BZP1&keywords=sata+usb+3.0&qid=1696945718&sprefix=sata+usb+3.%2Caps%2C130&sr=8-5
• JMT M3 anti-vibration standoff (you have to shorten the bolts to screw the standoff to the hdd) https://a.aliexpress.com/_mrn724i
• Ruthex RX-M2.5x5.7 threaded inserts https://www.ruthex.de/products/ruthex-gewindeeinsatz-m2-5-70-stuck-rx-m2-5x5-7-messing-gewindebuchsen