There are already people in japan using both the Usb-Audio PCB from electrart and the USBPAL from Rigisystems to record and playback DSD from Windows based PC's. After reading through every Japanese forum (using google translate) talking about this I could find, I was convinced they had this working for more than 1 year, and still NO talk about it in English except 1 single post on diyaudio from member 'Bunpei', the guy behind the sdtrans192 project!!
Needless to say I ordered the USB-Audio PCB as soon as I could contact them, and now I am waiting on receiving the Buffalo-II DAC to finish wiring it up. I also ordered a TI PCM4202EVM ADC evaluation module, so I could test recording immediately.
As soon as the Buffalo-II comes I will post updates. The only other hardware required was a few power supplies, 2 Bipolar supplies for the analog stage I/O, 2 5v supplies for the logic on the ADC and DAC. I have made tested my supplies, so as soon as the Buffalo-II arrives (already assembled and tested) I will be up and running.