Here is my KGTT + DAC (based on TwistedPearAudio.com OPUS DAC).
I just completed the case work for the DAC so that it matches the KGTT. The DAC has a USB input and Balanced and Single-ended outputs. The filter converts the balanced outputs to single ended by summing the inverting and non-inverting inputs.
KGTT + DAC - Front and back
Inside of DAC. From right to left is the USB input module (outputs I2S), OPUS DAC (WM8741), Filter, and Power Supplies.
These boards were all hand etched base on the TwistedPearAudio OPUS DAC. The WM8741 pads are about 12 mils (I'm surprised I was able to do this). I did the filter layout based on the Mfg spec for the WM8741. I'm thinking of putting a Dynalo in the front of the DAC. Not sure yet.
Here is the bottom of the KGTT. I put I gave it plenty of ventilation.
Here are three shots of the PTP wiring. I used silver solder on the connections. For better or worse, I connected the ground to the chassis earth. The DAC is not so I should not have ground loop issues.
Here is the top without the cover on. You can see the PS is mounted to the bottom and that there is a plate that I used to mount all the tube sockets / wiring that sits under the top cover.
I'm now working on a BHSE. I've complete the power supply and I'm working on a delay relay for the HT at the moment. I'm hoping to have this built in the next couple of months (just not enough time in the day).