Catching up with what I've done to my car:
Behind the pedal cluster before removing the old brake cylinder. The accelerator is at the top of the photo; the threaded rod goes into the back of the master cylinder.
Before I discovered the leak in the master cylinder, I thought the main front-to-back brake line was the leak, so I ended up cutting it to remove it. So now I need to manufacture a new brake line to replace it. The ends of the original line are bubbled flared, I can't buy a tool to bubble flare brake line, but I discovered that the other auto parts store in town sells brake line sections with bubble flared ends:
Here's one of the bubble flared lines that I've bent and is ready to install:
So, the current state is that the new master cylinder is in and I'm starting to put the brake system back together again. Hopefully more progress on Saturday.