I actually fit a low profile GPU, so the 500W PSU isn't actually necessary, but it also isn't overkill. I also replaced the fan in PSU with a Noctua.
I gutted the console, so the metal case is gone, but I retained the rigidity by keeping the four outer posts in the case, and by fastening the PSU right to the bottom of the case. The PSU is now structural lol, as is the DVI port.