Bit more progress today, cleaned up the earth point and used a Stinger fitting for the battery ground (1/0 cable).
The painted battery surround platform which houses the fuse holder was bolted into position along with the battery and ignition junction blocks (hidden under the surround)
Decklid spring is back on so it stays open without the old screwdriver in hinge trick - hopefully more work on the audio in the next week or so. Sub box went in this arvo (will get some pics soon) - just have to bolt it down.