19" 2U Rack that encloses the following components:
Mac Mini (End user to supply)
4X 3.5" SATA Drive Bays (End user to supply drives for bays)
Suitable fans for cooling of enclosure
Suitable power supply to power Fans, Drive Ports, and Mac Mini
2X USB C 3.0 Ports on the front plate of the rack that patch in to the Mac Mini's USB A ports.

All 4 Hard drive bays will connect to the Mac Mini via 1 Thunderbolt 4 Port, leaving the other ports available for the end user to connect external SSDs or other peripherals to the Mac Mini.

Each bay should be compatible with at least a 10TB Drive
All 4 Bays should have RAID 0, 1, and 5 capability as well as JBOD. This can be either hardware RAID via Onboard RAID Controller or software RAID via the Mac mini.

This needs to be very easy to use and customers should be able to add their own Mac Mini and Hard Drives into the enclosure without the need for any tools. Drives should smoothly slot into their bays.

Attached are design references. Branded components used in these renders are only for reference and placement. Exact power supply, fans, SATA to Thunderbolt interface and data ports can be generic parts but must be suitable for the product and the components within.

I look forward to doing business with you.