Success! This first pictures shows the Sofia board nested in place and the audio mod on the main board:
This picture shows the opposite end of the audio mod, connected to the RCA jacks. I picked up the ground from the bottom shield:
This picture shows the entire board, without shield:
This picture shows the shield in place. I had to remove a portion from the top, left corner and where you see the ribbon cable going under the board:
DVI to HDMI Cable right into Samsung 4K:
For the audio I have a 3.5mm Female to 2RCA Male Stereo Audio cable that I plug my PC speakers into.