Wow that is... Magnificent! I'm glad you de-dusted it but I'd be more worried about cables becoming disconnected while you're trying to clean it.
Glad it worked out for you though! Fingers crossed it continues to workπ€
FYI the PSU box with those black shielded power cables is meant to fit internally in the big hole at the top π€£
I usually use compressed air to clean the dust out of my cases. If you're feeling adventurous, you could slide that side panel off and attempt to re-home the PSU inside the case.ππ€£
It's my kinda computer lol π€£ Nothing should really short though as long as all the connectors are securely connected.