Quantity   Component name
1 × Raspberry Pi 4
2 × Kingston A400 480GB SSD
2 × SATA-to-USB3.0 adaptors not cheap ones from eBay! Get something branded.
1 × microSD card (for RPi image)
2 × ZVN4306A Discrete Semiconductors / Transistors, MOSFETs, FETs, IGBTs N-channel MOSFET
1 × LM2596 3A adjustable buck converter dc-dc switcher module
1 × 6-cell AA holder and cells 9V battery of AAs