Track Rat
Just Your Average Sized Member
I'd mount the patchbay at the bottom of the rack cause you don't want the cables hanging down over the front of your gear. I'd put the tube pre at the top cause it'll generate the most heat and heat rises. Also keep your power cords and audio lines as far apart as possible to minimize 60 cycle interference (same goes for the wall warts). If you have the room put a single space empty below the mic pre as well so it can vent.