The problem with multi-tech requirements is that they don't really work all that well in SEIV. There is no way to know that something is a multi-tech required technology until it appears....having researched the technology. This would be better if we had a tech tree that actually looked like a tech tree such as the one in Gal Civ but we do not.
In the next version of the STM planets will have a higher popluation limit, more space for storage, and facilities.
Thanks for the comments guys.