Thanks, it's fun, but challenging. I ended up using some needle nose pliers (no pun intended) to push/pull the second needle through the hole. I wrapped the jaws of the pliers with duct tape to keep the teeth from damaging the needles. Don't know if there is a better tool for this.
I finished sewing the sheath this evening. Then treated it with some Neatsfoot oil and then some Montana Pitch blend for water protection. Finally, topped it with a bit of Lincoln Wax for a little shine and a tad more protection. Burnished the edges with an old dowel.
My belt loop got canted a bit....uh, I did that on purpose, yeah; I like a 5º reverse cant in case I'm working from horseback, yeah, that's it.
I think I need to do a little more finishing work before sewing in the belt loop. In this case I skived the ends and ended up skiving some of the end off. I should have stopped, re-cut a belt loop, and then finished it up before sewing in. Live and learn.