I want to add a headphone socket on the front of my VS700R.
I'm very competent with electrical repairs/soldering etc.
 
Thanks to the images that Dyonight posted in the post "BLA and the VS700-R" I can see that there's plenty of room inside the front of the unit here :

 
I intend to fit the components from my headphone amp that I don't use anymore which is similar to but not exactly the same as this  :

 
The sound quality isn't massively important to me as I will do my final mixes on monitors.
 
Does anyone have detailed schematics of the VS700R?
I know the VS700R to VS700C connection on the rear has two headphone outputs that go to the VS700C.
It would be good if I could tap into one of these so maybe a pin out diagram for this cable would help.
It would also be good to tap into a 9vdc power supply inside the unit or maybe use the 5v power connected to the fan?

Why do you go into a hassle of breaking up the unit and solder something into it yourself when you have 10 OUTs that you can use to send (headphone)mixes to?
 
If you are not worried about sound quality just plug in a cheap heaphone amp from the B-brand and your are ready to go ... or get a proper headphone amp and use it for headphone mixes ...
 
just my 50c

I can understand wanting to have the headphone outputs on the VS700R or the back of the VS700C. Not a big fan of the cords coming off the C right at my elbow. But then those are for a different user I guess.
What works for me:
I have two 6-channel Rane headphone amps (cost me $200) wired into outputs 1-2 and 3-4 and use sends off the master out pre-fader just on the VS700R that work great. Or I can set up monitor mixes using channel sends going to those outputs for individual mixes. The Sub gives me another mix if I need it. Same deal for different pairs of studio monitors. Right now I have the mains going to my Focal CMS50's and the Sub going to a pair of Roland DS90A's and 9-10 going to another amp feeding a pair of Auratones. Then there is the Octa-Capture and it's tools. Not ready to solder, but as I said before, I get it.