Lot of ideas here but mostly revolving around Bitcoin nodes. I'll look into Umbrel and citadel to see how/if they can run on amd64 just for testing.

Ive got an SSD I can put into it, but under 500gb and would need to run pruned.

Still, I need to scrounge up some sats to replace the battery in this thing as the old one causes it to fail startup checks and the only way it runs right now is plugged in, battery out. But the rest of it is surprisingly sturdy. Good casing compared to cheap Lenovo's and screen and touchpad are decent as well. Has Ethernet and HDMI ports and even a Blu-ray player. Rare these days.