Thats an N64 and a CD64 (I think it is called that, its a backup unit for N64 that uses a standard PC CDrom loading N64 roms of a burned CD).
I think it looks really bad but he got lots of good comments on the looks of it when he posted it on hardforums. Must have been all the screws and the plexi turning on PC-modders.
I thought about doing something similar when I had a Z64 that I flashed with a new bios so it could use a harddrive but eventually I sold my Z64 last year for 300 dollars..