Quote Originally Posted by factotum View Post
One thing I will say: when building a base, be sure to pay attention to the hull strength. This goes down when adding new modules, and up if you add reinforcements to the base. If the hull strength goes below 0 then you'll start getting flooding and that's a real pain to deal with.
Minor caveat: that only applies if you’re building underwater. If your base is over the waves you can ignore reinforcement.

That said, there are a few modules later in the game that can be problematic if you build them in open air.