Actually, this isn't bad...the only real issues I see here are...
You need a PROPER stereo mixer, ie: one that actually has panning over your mono signals. Instead of the Intellijel that's there, have a look at some of Ladik's manual stereo mixers. Their M-172 gives you four pannable mono channels plus one stereo, and also features 1/4" isolated outs. And...
The tile row, as it stands now, isn't what it could be. I'd recommend this lineup:
(If this isn't showing up, check back later. MG's server seems to be throwing another tantrum over the Screenshot mode)
This keeps the I/O (why in the name of all that's holy did Intellijel discontinue the all-in-one module for this, though?) and the QuadrATT and FX I/O, but adds the very useful Noise Tools and a DuATT, plus a USB power module in case you need to power something like a controller, etc. Much more potent, and it eliminates the mults which really aren't all that necessary in a small build (just use inline mults instead, and save space for things like this).