Thank you all again for your support. The Dweezil Zappa video is so great. Love the grace with which he takes the "modifications" the airline made. My repair certainly isn't as bad as that one. I doubt I'll need to install splines or anything like that.
Thank you for the resources that you all have provided, too. I have sought out a copy of the Erlewine book, and Frets.com has proven to be a blessing!! I found
a repair journal for a crack that looks just like a worse version of the crack in this neck. This is going to be the main "guide" I go by. But I don't think I'll have access to hide glue, so I will buy my own wood glue. I don't own a vehicle to leave my bass in, and I keep it away from open windows, so I don't see the potential expansion of the glue as a problem. If I can get hide glue I will use it.
I'm sort of planning in my head how I'm going to work on the neck. My bestie's dad is a carpenter so I'm going to ask if I can use his shop. I don't expect to use any power tools. I need to remove the tuners and get some padded cauls on either side. Ideally the padding will match the contour of the neck, but I may have to work some scrap to match it. A flat caul on the top with padding would also be ideal.
...am I understanding what a "caul" is correctly? It sounds like it's a piece of wood that you use to prevent damage from the clamp to the instrument.
I've started inspecting the Ibanez, too, the guts of which will go into this P-Bass. The two pieces of the pickup are in the opposite place, as you can see in the picture below, but my understanding is that that these are two separate pieces and can be switched around. I will need to get soldering tools to handle this, since I don't know how I'm gonna take it all out with the wires intact. The good news is: I did check and the knobs fit on the p-bass like a dream! (I did end up just de-tensioning the strings instead of removing them entirely, though. I will remove them soon as I need to get the tuners swapped out.)
I have NEVER done any electrical work before so does anyone have any recommendations for safety? I won't have the electronics plugged in, of course. But I'm going to try and use the wiring from the broken p-pickup on the white bass as a guideline for how to do the wiring. Should I pick up some fresh wire while I'm at it? Safety goggles?
It sounds like the main expenses to me will be new strings and possibly some shielding material for inside the bass. I think I can harvest most of this stuff from my Ibanez: the pickup, the knobs, and the tuners. Maybe even the strings...but I'd have the same problem of using long-scale strings on a short scale bass that I did with my Jaguar. They work fine but have a hard time holding their tune. (Did I mention this is a short scale bass?)
Last, any detectives know anything about what this bass might be just from the body and make? Any way for me to find out? Like I said, it has no branding and the serial sticker was taken off. I'm sure it's an old copy of a copy or something. But I can't wait to get them working again.
Thank you all for your continued guidance!!