Finally finished it, to be honest it could have done with a few more photos but hopefully it's clear enough. Probably only an hour's work, perhaps two if you are taking your time and figuring out how to remove trims.
The guide makes it look like a big job but it's just because I'm trying to be thorough as a few guides I've seen on other sites would skip the odd bit and when it comes to auto electrics I think it's more reassuring to give as much info as possible.
PDF also attached to this guide.
Dash Cam Hardwiring Tutorial 1.0
Accord 03-08 (Will Apply to Multiple Models/Cameras)