Thanks for all the pointers.

I think I will purchase a new chainring; all the ones I have are beat up. Luckily, I found a 36 hole rim in really nice condition, so the 36 hole hub won't be a problem. The hub I've been looking at comes with a lockring and costs $72. I figure I'll end up spending about $150 on new parts; that's not bad.

Thanks for the info on spacing and drive ratio. I'll look into that.