I'm currently in the 'creating schematic' stage. I've breadborded the input preamp stage, tested it. Read the ADC and DAC datasheets, took recommended schematics from there. 

Today schema is finished (current version look like this) so I've started designing a PCB. I hope to finish it this week so I can order the PCB from manufacturer, get the missing parts at weekend and assemble the board at the next week.