hi Garioch43,
I've decided to do as you suggest - use existing conns on the head unit for basic speaker config but run RCAs into the glovebox for future. The existing speakers are all wired into connectors in the boot which i'm going to tap off (FR, FL, RR and RL) and run to the head unit. The previous MFD install had the DSP amp, radio etc in the boot. All the speakers are connected through 3 connectors CO491, CO492 and CO493 - i'll do the mid and high range speakers once the amp is installed and i'm over teh initial trauma ;-) .
I've just ordered a 6 channel amplifier which i'll fit under the seat and connect up later.
Cannot say i'm looking forwards to the heating pipes - did you dremel a strip of them out from the top and then duck tape them back down or did you just use a heat gun and press on them then leave them to cool?
Any advice on heating pipes much appreciated - i'll be adding photos as the install goes ;-)
Cheers for now
James.