I have a question. If you know which parts to buy, how did you come up with that? That might be a better direction to go. You bought the parts. There is more than one way to go. Which valves are you going to use? I see all kinds of options, I'm not sure I'd be that anxious to start that project without a clear path to a working preamp again.
BUT I'm no spring chicken either.
You just looking for the experience or what?
There is a pic with a MM installed.
Regards