I do honestly feel your pain, but PMSL at your laid back humour and approach to it. Fair play to you for getting stuck in, and your patience.
I would have been at a total loss already and given up on it. But then electrics have never been my thing, and I'm not even that hot with mechanics.
I fail to understand why anyone would need or want to start mucking about with the original loom. Like you say from what I can see its a car fire waiting to happen which I have to say in a controlled enviroment,
, might have been the easy option for you right now.
At least we all know where to come should we need a "how to" remove your dash
Chin up looks like you have nearly cracked it..