[Cheeze]

Weapons platforms are not a planet facility, but are listed in the cargo for the planet. So, particularly on small planets or ones with a different atmosphere than the race colonizing it, be careful of how many you put there.

In addition, weapons platform are listed by the number of a particular type. This can be a problem if you wish to replace older platforms or just make some space. You would have to dump all of one type. So if you want to keep some on the planet (of one weapons platform design), have a cargo ship or space station in orbit which can hold them!