Normal
I agree, normally ac/dc power supplies are housed inside their own enclosure even when inside of an enclosure, but some electronics have those types of PSU's enclosed; not entirely sure of what calls for that. And agreed, there are far cheaper 1u and flex ATX power supplies out there, I just linked that one for example with some quick googling. When are you expecting to receive your mc600? I'm hoping I can get a gtx 1080 mini to fit in there; from the dimensions on logic supply's website, it looks like the case is just a few mm too short.