Glad to know km not the only one that likes alien 3. Save for the plan to get the creature in the foundry it was a great film.
Still a bit iffy on the queen however. They take a whole load of room to house and while webbed up are kinda vulnerable. Plus from an immersion perspective I am left thinking that if they are going to squirt out eggs from a sack they must eat people and then your not getting any more eggs for your buck, may as well just ovimorphed someone.
Unless the Queen doesn't need a viable host, just biomass, in which case, the queen is pumping out a bunch of the same kind. Ovomorphs provide a chance for random genetic trait jumping (this actually happens with bacteria!) from genome to genome; the queen is a straight replicator being fed biomass, providing for a uniform brood once a successful stage 1 survives long enough to become a queen stage. (At that point, there are probably a dozen strains, and the strongest is likely to become the queen.)
The two existing in the same organism are not all that unrealistic, either; several species on earth have multiple morphological stages, with two or more stages being breeders of different kinds. A number of fish are born neuter, grow to become one gender, and a handful in the school become the opposite gender; Several lizards are capable of parthenogenisis and sexual reproduction, and have gestational temperature triggered gender. A few wasps are individually capable breeders but do have a more productive queen type, albeit the queen is not a separate stage, but a different adult stage.