...not to be a wise ass, and I know that you didn't ask, but just throwing this out there...have you considered something like the Fractal Audio AxeFx? Call me a fanboy, but I ditched pedals and rack processors years ago for the Axefx and have never looked back. 2 rack units tall and a MIDI pedalboard and DONE...virtually unlimited routing flexibility and tons of fx processors to choose from. The prospect of moving, setting up and troubleshooting a rig like you're describing would give me nightmares.
I play a lot of the same stuff you're playing (Zep, Sabbath, Tool, Disturbed, etc.). The AxeFx can either replace your preamp, or be used for FX only in your head's loop or in front of the head's input. All good. IMO worth a look.
...again...FWIW...and sorry to drag this off topic if it's out of line...as you were