All internal. The PSU is a 160w flexATX from some fossilized Gateway I scored out of a dumpster. I bought a brand new mATX 150W and I gutted it, but it didn’t work – :rofl that’s what I get for not checking it before cutting metal.
I cut out the AC adapter area in the back to accept a standard 3 prong computer PSU cord receptacle. All items are stashed inside the NES completely.