Amazing movie for a true Alien fan looking for answers

Rating: 10/10 (8 June 2012)

I'll just state how I interpret this movie instead of fighting other viewpoints.
1. The Engineer in the opening scene was the one that sacrificed himself to spread their DNA into Earth's ecosystem.
2. LV-223 is a moon, LV-426 is a planet. Considering the similarity in names they are most likely same system if not LV-223 orbiting LV-426.
3. Yeah we saw many ships in the beginning, like LV-223 was some kind of Engineer's moon airport or Bioweapons launch station. So no, the one that crashed in the end wasn't the one on LV-426. Prolly won't see it happen in the sequel either because the dating the crew gives in Alien would have to place the crash before Prometheus took place. Meaning that several Ships under went a contamination from their bioweapon cargo.
4. The aliens seen in this movie are the original, out of the petri dish design created by the Engineers. The Aliens that we all know of are actually second gen aliens DNA mixed with the Engineers before they breed with humans. You never see what the aliens look like in Alien BEFORE they infest the crew. So the one that hatched from the engineer on the pilot seat could be different in comparison and the only one birthed - the queen which layed all those eggs- for Nostromo to find. If the sequel does play into it maybe they'll show where that queen went, cause she sure as hell wasn't guarding the nest.
5. The Alien species is constantly referred to as the Perfect Organism. Considering evolution, it makes sense that we don't get to see the alien we've come to know. But you can see similarities everywhere. Like the mural with the Queen Alien on the wall in the ship. Or that giant prototype face hugger that gets the last Engineer.
6. The Engineers sabotaged their own fate on that ship so it would lead humans to the cryotubes so the pilot would awaken when they knew humanity was evolved enough to receive the contamination. Most of the alien imagery was staged to show them how to operate the ship and where to go to get infected.
Biggest questions I have, maybe some of you can help out here;
1. Why was humanity engineered by this race to test the bioweapons on? what were they trying to create it for?
2. The end of the credits placed a future date on the Weyland Corps making better worlds advertisement for... i think it was OCT maybe NOV. did i read it wrong?
3. What was David's agenda for contaminating the crew if he was placed there to get Weyland to see the Creators? Does he have another purpose? maybe an alternate employer? (if that was the case id assume it would be the Yutani corp looking for the bioweapon and eventually buying out weyland because all of its executives, along with its stocks, die on LV-223).