Hi,
currently there is no progress.
There are many reasons. At least I have the combination AES => DAC, ADC => AES running. Many GDIY-members ordered this combination, too but I've never seen somebody building this.
Then I started to make a main board. This main board was based on ADAT i/o and offered some routing. This was almost done and then the wavefront ADAT chips reached EOL. Thus, the design of the mainboard became obsolete. :'(
Then there was question about USB connectivity. I tried to do something with XMOS but it turned out, that it is not so easy. I downloaded all the free software of XMOS but never succeeded to setup the reference design for UAC2.0 for compiling.
But, there is now the USBstreamer of minidsp. At least you can connect 8 i/os with it and they claim that you can use the USBstreamers in parallel to increase the i/o count. Currently I'm giving it a try for a job-related project.
Due to the story of the main board I'm thinking of giving it another try, too. I'm going to open a new thread about it soon.
R.