Firstly a big shout out to @davfor taking the time to talk to me about my system, its much appreciated sir
Well it's still not ready however I've finally finished and installed both rear speaker pods!
Front speakers are all reinstalled, removed crossover as per @davreccpmendations and reran additional cables sp front mids and tweeters will all be on their own channels on the amp
New loom ran from headunit to amp for 4 speaker outputs/inputs
I've ordered a new headunit that also supports optical so you've guessed it, ran that cable too just in case!
Getting on with the amp board, power cables installed and link cable from the ap8.9 to the ap1d
Also installed the control cables so the remote out from the forza is on the remote in for the ap1d, just need to wire the remote from headunit to amp and we should be nearly good to go.
Here's how the board looks as we speak
View attachment 175745