PM replied to, sorry been busy all weekend. Hope it clarifies.
No worries, thanks for taking the time
Got a load of bits on order, but need to go to Maplins for some audio cable for use on the CDC loom.
Basically going to follow the Russian guide
The White / Red leads on the RCA cable you mentioned should be fine to use.
Saves a trip then, always know their prices are way to high.
I could recycle the yellow one as an earth then.
So my plan is:
1) Separate the CDC/Radio, to get access to loom.
2) Stanley knife to split out 2,4 & 8.
3) Cut them in the middle of the loom (?)
4) Attach L/R audio feeds to the 2 & 4 so that RCA leads directly to main H/U.
*at this point can I just leave 2,4 coming off the plug just taped off? Since I don't need them, nor do I want CDC.
5) Take cable from 2 & 4 onto an earth on 8.
* for this, can the earth be on my part of the L/R? (new extended loom) or as part of the same join?
e.g. what I solder onto 2 from loom, I can solder on an L feed, along with earth?