Defense structure is what I was refering to since it's part of the topic. I'm saying you gonna spend way too much time going around each planet and every turn building a structure one by one AND pick out the type you want? Do you really want to spend that much time just to build static planetary defense structures? What happened to KISSIf there is a defensive structure, I'd want it to be something like Smac's/Civ's citywalls. If you need more defense on a planet, perhaps because it's a fortress world meant to defend a chokepoint or the location of an important shipyard, then the player would use another build slot to construct a second defensive structure of the same type.
Not on fleet strength. I already suggested a basic formula based on ship sizes to decide fleet str long ago. You want to able to approximate the str but not to the decimal so all you have to do is compare the numbers and you know whether you will win or not.