Just gutted the XL+ out of the rack and re-did it all tonight...
Gator 4U Audio Rack - Powered Rolling (GRR-4PL-US). The handle works great and rolls really well. Except over cables laying around on stage. :0 Overall, very happy with it. Pretty much like rolling around luggage in an airport. The front and back lids have plenty of room to leave the Shure PSM antenna plugged in.
Fairly simple setup:
AXE-FX Output 1: FOH or QSC K10 monitor (depending on gig)
AXE-FX Output 2: Rolls mixer inputs 5/6 for IEM Mix
Rolls Mixer Main Stereo Outs: These go right into a Shure PSM 900
Depending on the gig, I've done anything from run an ambient mic into the Rolls and blended with the AXE-FX for my entire monitor mix. Or can plug the output of an Aviom type system into 1/2 of the Rolls. And in other cases, I've taken mono/stereo sends from the FOH mixer back into the Rolls. Used the FOH mixer iPad app to mix the rest of the band, this goes into the Rolls, and then I blend it all in with the AxeFX signal. No matter the gig, I'm always using IEM's.
The cables are kind of messy right now, but everything fits. I put the Shure PSM in the back. The black box with the RJ45 connection is my breakout box for the FCB1010 for bi-directional MIDI, power, and supports a momentary switch mounted on the FCB1010 for tap tempo, all going over a single ethernet connection. The breakout box has a 1/4 jack that ties into the Pedal 2 connection of the Axe FX. Below the breakout box (hard to see) are two midi mergers with bluetooth MIDI connected. It merges both incoming and outgoing MIDI between the Axe-FX, FCB1010, and Yamaha MD-BT01 bluetooth adapter. I use Fracpad (via iPad/iPhone) for tweaking patches during sound check and not having to run back to the Axe FX. If I change a scene on the 1010, Fracpad updates accordingly along with the Axe, if I change something via Fracpad, 1010 and Axe update. So works really well. Also can put Fracpad into the mode where it shows all the stomp boxes/amps. Cool to see it update when you change scenes and what not on the 1010. Of course, all of that was using the XL+. Will have to see how things pan out regarding official iOS app, or Fracpad updates, etc...
The only thing left I am going to do is bring the most frequently used connections on the Axe and Rolls to a patch panel. So I'm not reaching all the way into the rack and fumbling with connections. The III being a bit shallower really helped. Otherwise I don't think this all would have went into the same 4U rack I was using for my XL+.
Until the official FC-6/FC-12 pedals come out, I will have to see how much of the EurekaPROM will work (if at all) on the III. Worse case, I will pop the stock chip back in, and do basic scene changes, tap tempo, expression pedals, and use one way midi.