Yeah!
I finally built this and got it running using Keeb's layout. My own was too massive and unwieldy

I had a bad J201 so it didn't work for a while (again). Once I swapped it out it works! I tested it in AmpKit.
However, in the meantime while trying to get this thing running, I bought an AmpKitLink adapter. Now that I test both of them back to back, let me tell you the sound quality of the Peavey thing is miles beyond the iRig. The iRig thing has feedback like crazy on distorted amps, the AmpKit Link has none.
As for the software, it's pretty close, between AmpKit and Amplitube, from a few quick tests. The AmpKit Link still makes Amplitube sound better though.
Unfortunately I haven't got the guts to open my AmpKit Link just yet, so no pics or schematics yet.