Yes, I did exhaust all the threads that I could find. Unfortunately I couldn't find anything that was exactly the same as my situation but some impressive repairs of cabs and lots of good tips on possible leak spots for cabs.
I persevered with mine and am just putting the trim etc back up after drying and rebuilding. In case there are other desperate newbies browsing I'll upload my photographs when I get back from the trip. My damage wasn't catastrophic and I was able to clean it out without removing the seams or skin. It will get a going over for leaks in the shop when I get back but I've sealed everything I can find with a self sealing aluminim repair tape to at least get me through the trip.
I agree with one of the threads that it's not the work skill level, though that is daunting, but the research and understanding or lack of of how an rv is put together. I had no idea the skin was a coated plywood and the wet wood I was removing was the shell itself, and would definitely have approached things differently. (Gentler, looked to dry out rather than remove).
I've learnt some things:
The hair dryer is your friend when looking to dry out fast;
Don't keep attacking rotten wood unless you want to punch a whole in your floor (very disappointed to have put a crack in mine);
Label all the screws you remove (even placing stretegicly wasn't enough).
It's actually not that hard, or expensive, and can be extremely rewarding, if you have the time.