I think it should center around the beacon and the discovery of the Derelict.
This is what I had in mind.
A crew of 8 land on the planet looking for places to set up colonies and discover the Derelict. When they go inside, one of them triggers a device that brings two eggs up in an elevator. Both of them hatch and one of facehuggers pounces on the crew member while the other vanishes.
After more studying of the Derelict, the crew find the infected crew member and take them back to the ship, but they are killed by the chestburster.
One of the crew finds the chestburster and stabs it but the acid blood kills them. The remaining crew find the body, and the shed skin.
They contact Earth and request help, telling of what has happened. Afterwards, they discuss the Derelict. Since they deciphered some of the language, they find the aliens were intended as weapons but find nothing of their orgins. (Lets keep that a mystery folks.)
The alien gradually kills the crew until only one is left. The survivor heads to the Derelict with a flamethrower and kills the alien in the Space Jockey chamber, burning a hole into the floor and revealing the egg chamber. The survivor activates the beacon on the ship as a warning and takes off, only to be facehugged by the missing facehugger.
Once they wake up, they realize what will happen and set the ship to self destruct. As time runs out, the survivor is killed, revealing that they were carrying a queen, just as the ship explodes.
Back on Earth, a man sitting at a computer accesses the Mother Module of the Nostromo and sends Special Order 937, setting up the events of ALIEN.
