When I was planning the wiring scheme for the Baby Desktop O2, originally, I thought I would use 3 and 4 pin board mounted posts with equivalent pin connectors so all the flying wires could be disconnected from the board. I realized that would be too much work(and probably even more prone to disconnection so I only made one of the connections removable (the 3 pin P1 jack for the RCA inputs, beside the input J2 connector).
(note to add part #s for the pins and connectors I used)

Make sure you grind off the anodized coating around the holes on the inside of the panel before you mount the RCAs to get a good ground connection.

I used individual pairs of wire from solid core Cat5 cable for all the connections, and in my wiring description, I'll be using the wire colours from the cable I used. (it helped since I built 16 of them.. )

For P1 (for RCA input) I used Brown/white for Right and Blue/white for Left. The square pad(close to the the...

The B2 file is for the BOX Enclosures B2-080 case, that is used in the standard "transportable" O2

The B3 files are for front and rear panels on a BOX Enclosures B3-080 case, used in the "Baby" desktop configuration of the O2. This configuration includes mounting holes for a 1/4" headphone jack and volume control on the front, with all the rest of the jacks and buttons on the back, along with a pair of RCA jacks for input. The PC board in Baby Desktop is installed backwards.