Thanks for replies.
I was just interested because i know these boxes are designed for the living room. My worry with hooking up a tower in the living room was that not only would it look aesthetically strange but as I have a carpet and a cat, that the air grids/fans could get clogged up by and fluff/cat hair.
But you're right if you have a relatively small FORM PC. slightly off the ground it should be possible without the crazy cost, or risk of clogging/overheating. SSDs are coming down all the time, so I may wait a year or so.
But has anyone done this here, essentially used a PC in a console set up.