Following this thread and hifiduino's blog with a lot of interest!

By way of background - I have really enjoyed building a couple of bh amps, battery powered amps and have a wire se-se half done on my bench, but I was wondering if any of you more experienced builders might field a couple of total nub questions regarding diy dac setups and power supplies as I try to envision, big picture, what a soekris build might look like. 

The new details spelled out on hifiduino (https://hifiduino.wordpress.com/2015/03/16/soekris-dam-1021-r-2r-dac-users-guide/), appear to use three regulated psu's: (1) running into the pwr in headers on the main dac board, in liue of powering it with ac straight from a transformer; (2) to power a diyinhk usb -> i2s source, which evidently has superior oscillators to an amanero but requires an external 3.3v power source; and (3) for the iso +3.3v header on the dac board.  I guess maybe the i2s and iso +3.3v can both be powered off a dual board like: http://www.diyinhk.com/shop/audio-kits/46-17uv-ultralow-noise-dac-power-supply-regulator-33v55v-1ax4.html ?  Do I have that much right? 

I gather the far simpler, but less sophisticated alternative, would be to run a single transformer straight to the dac board to take advantage of the onboard supply, and then to add in something like an amanero for usb -> i2s.  amanero also has a 3.3v ouput, and then you use that to power the iso +3.3v?

If you run the more complex setup, I understand this will require an appropriate transformer for each psu board.  Can those transformers simply be wired in parallel with the IEC jack?  And is it standard practice, as in the case of bh kits, to connect the earth ground pin of the IEC to the chassis?  I'm comfortable (I think) with wiring up the signal portion of the build, but I wish I could find a simple primer on how to properly wire the IEC, transformer(s), and psu board end of things.  I know for example, properly mounting a transformer with isolation washers in the right locations is critical to a safe build, but without a manual to guide me, I'm afraid I'm clueless.  (E.g., Hifiduino depicts an amveco transformer on the page linked above that looks like it is intended for through-hole mounting.  How would one go about putting something like that in a standard chassis - up on a breadboard on standoffs?)  Thanks much for any guidance you guys can offer.

Nice work Chris! Yep, raw output is definitely better. Be sure to provide high quality 3.3v to the 'dirty' ISO connection; makes an audible improvement. If the BIB's are for upgrading the power of this DAC, I'd highly suggest the Reflector-D's instead. BIB's are great for analog, Reflector-D's will excel powering digital circuits.

BIB's pretty good with digital circuits - you'll want to use Silmic II's or similar at key cap positions. But - Reflektor-D's resulted in a clear, audible improvement when applied to digital circuits. I have a drawer of BIB's I've swapped out of a couple of DAC's :-)

Tea-Bag at diyaudio runs a group guy every few months. There's a signup list - he's close to doing another run.

I am using single IEC and connecting all the trafos on the IEC output directly (no daisy chain).