Small update, assebmled new revision of PCB (rev. C so far). This has few minor improvements and fixes, and most importantly, it is size compatible with Raspberry Pi case, which you can by anywhere for few bucks. 

I did some audio tests and at this stage I don't have any issues with sound quality. Noises are at good (unhearable) level, audio lacking any hearable issues and weel compares with other PCBs I've made with the same DAC (and actually sonds better than same DAC sold as module in chinese stores)