Yes. I am familiar with that kit. I did the foil trace layout for it and Andrew, aka drlava, set it up in CAD and sent it to a fabricator.
I don't know if Andrew updated the kit or not, but the one we sold some time ago had some limitations. I have since updated my design.
The one big thing is the fact that it cannot compensate for the lower DC offset found on the CM6206.
I know you got the CM106, but you should look at the Sabrent USB-SND8.
It has 8 channels, not 6. So you can also have stereo audio tracks.
It is the board I used in the pictures in that thread.
James.