Welcome aboard, Scratch. We're glad to have you. You sound like quite a few of us around here.
The last computer I cobbled together from spare parts I sold to the daughter of a buddy of mine. Ryzen 1600, MSI B350 Gaming Plus, Antec 550W PSU from my last upgrade, 2x4GB RAM, 500GB SSD, RX570, and bought a Cooler Master MasterBox K500 to house it all.