Ok I see, I did not know the lx v6 was drum rear. Ok then the drum disc combo won't work since you don't plan changing knuckles. Good luck with your project, sorry I was no help.
bolt 5-bolt bearing, before you install studs, to one hole, the center (thing) should keep it centered whether you do it f/b.
Use a spare M14 bolt/nut.
All holes are there, it doesn't even matter if they're perfect, wheel clamp holds the drum, IIRC I used a unibit (when I drilled 5-lug 300zx rotors to bolt on a 4-lug 240sx, the other way )