The reason that Sentinels (fourth robotech series btw.) was never finished was that they ran out of production money. To bad though. I've read a synopsis of that series, and it would have rocked. Finishing with a massive battle between the Invid queen and an ancient entity on who gets to become a god. It ends with the queen seeding victory to the entity, when she realises that all life will be extinguished if they continue to battle. Other coll points include the destruction of the old universe (don't worry, everybody important survives it.) and a creation of a new. Also all the surving characters from the three first series would have been brought back for the series.
As far as I know most of the Macross movies take place after the fourth series...
Later,