[Fyron]

I do want to add space monsters. I need to understand the basic's. I can pirate the concept from D mod, however I need his permission. Second, I need to understand how they function and how to "hide" there planet. This may mean that I will have to add a planet cloak ability.

Nope. You do not want to use that ability. You want to use the sector - sight obscuration ability. If the planet is cloaked with an actual cloaking facility, it will be unable to build ships. Just go through Devnull mod and copy everything over from each file that requires Monster techs. The stuff should be at the end of every file. I have 0 doubt that Rollo will give you permission to use the monsters. Just email him.