Excellent and a hearty welcome from another dedicated DIYer. I intend to get at least 3 of my four Airstreams roadable by the end of the summer. I guess my DIY hormone goes in spurts. I hope you guys have an inside place to work over the winter!
In my experience of trying to document my rennovations, I think making separate threads for each major task is a really good idea. It's nice to keep everything in one thread--all the rest of us can follow that much more easily--but when you want to go back and refer to some particular detail, separate threads work better. From the sounds of things, you're going to have a boatload of posts to talk about all your work. Moving the bath and a window are pretty unique, so I'm sure we'll all be watching for those threads.
BTGW, I took all my vista view windows out of my Airstreams. They leak, look dingy, and allow way too much heat flux. If I need more light, I go outside.
Maybe you could keep track of everything by starting all your threads in a unique way, like some far north (apologies to our Canadian members) nordick term, or even booyah!