OK, all my parts have arrived !  Now to see if I can put them together without screwing anything up too bad.  

slow and steady. It's a cakewalk.

I've done a few and it's pretty easy but fun. Trickiest part for me (very easy now) was the front pivot pin. I hold the detent with some needle nose pliers in one hand and with the other I push the pivot pin down and in so as soon as it clears the hole, it goes right in. If you didn't order some extra detents, make sure your reciever is in a horizontal position aimed at a towell taped up on a wall. That way, when the detent goes shooting off at 5000 fps, you have a chance of finding it.
Good luck!