I finished this one up last night... the mystery wood fingerboard (wenge', or whatever it is) polished up very nice. I rubbed in two coats of finishing wax to seal the pores, and buffed it out. Very happy with the results. Even happier I didn't have break out the rattle-can.
Other than leveling the fingerboard, the biggest job here was reshaping the neck. Like I was saying up-thread, these things were still green when they were cut out, and many of them warped badly as they cured. And they are huge, clubby, clunky necks, sometimes hard to even get your hand around. Now that they've hopefully done all the twisting and pulling that they're going to, no reason not to take a rasp and file to them. This is my favorite part! Nothing fancy about it, just keep shaving and cutting off wood until it feels like a bass neck should - simple. Then smooth out file marks with (progressively;) coarse-grit sandpaper, emory cloth strips, fine-grit sandpaper, and finally ultra-fine grit, followed by steel wool. I like to 'raise the grain' several times with a dampened paper towel. This will fuzz up the wood again, and then you get one more good buffing. The end result is a very smooth surface. (I do this on the fingerboard surface too... actually, sometimes I wet-sand ebony or rosewood with 1200-grit) I use the same Minwax product on the bare wood here as I use on the fingerboards.
One thing you might catch - typical of these basses, this one had a pretty low grade of maple for the neck. Down close to the body, it had a knothole in it. While I was working the neck down, I filled the hole with some CA glue and sawdust filings. Once rubbed out, this neck actually has some nice figure to it, which you can really see 'pop' after having been oil-treated. It plays lightning-fast now, and with a new set of D'Addario Zyex strings installed and the bridge and soundpost recut, nut slots filed, it's ready to go.
Total time, 6 hours. Strings were $150. The bass itself, was a $600 Craigslist find. They'll have about $1200 in it now, which isn't too bad for a decent playing, structurally solid upright.
Now... back to work on the King MorTone!