OK, I was thinking.....
It won't matter what equipment the ship has stock, it's all going to be interchangeable. You will only have to worry about Item Port size and available power and cooling.
IT'S RED MAGE TIME!!!!
Let's start with a generic "SHIP" It has 2 crew and a cargo bay. And you are able to move around in the ship. (Disclaimer: NONE of these are actual figures from SC, I am pulling them out of thin air for demo purposes)
Power Plant = S3
Engines = 2x S2
MAV = 8x S1
Cooler = S3
Weapons = 4x S2
Avionics = S2
Sensor = S2
Life Support = S2
For example reasons, we will say the Power Plant generates 15k "power units" and 5k "heat units". the engines require 2500 power each, and put out the same in heat.
So here is where we stand: Power = 15000-5000(engines) = 10000 (left to run the rest of the ship)
Heat = (2500+2500)(engines)+5000(power plant) = 10000
Now let's throw in some other figures, Power will be (p) and heat will be (h) and we will put this as unit per second. We also know there will be other resources you will need to manage, like CPU power and such, but I have not seen any of those figures in the game so far. I have seen the Heat and power figures used (2.3ish, when the holo table worked).
MAVs = 250p : 250h (I am lumping all of the MAVs into one figure as they don't run all the time)
Cooler = 5000p : 20000h
weapons = (idle)100p : 100h :: (firing)1000p : 1000h (x4)
(weapons are tricky, as they are not firing all the time, and while they are idle, they use a fraction of the resources as they do when they are firing)
Sensors = 500p : 150h
Life Support = 200p : 100h
Avionics = 100p : 100h
Now, that leaves about 3500p when the ship is idle, but in the hole if we have all guns blazing....and NO SHIELDS!!!!!
Crap, I forgot the shields
So, let's put some S2s on at 500p : 500h, that jumps up to 1k each while charging. Which would put us in the hole a lot with everything going at once.
It boils down to available power and cooling and CPU and Item Port size. And out of those, the only one the system won't let you fudge is the port size. If you overdraw the system, it's your own fault. Take the Strife Mass Drivers, and load up 6 of them on a Super Hornet. 1 Alpha Strike and the ship shuts down(well it used to, I haven't had a chance to try it out lately, plus it did it to the Cutlass as well)
Now I am sure I missed a few things, and again, these are numbers I made up on the fly. The point is, those numbers will change based on the component, and what it can do. The stock parts will almost always be worse than the stuff we will find in the aftermarket shops in game, and what we can make ourselves. Or Overclock, as the case may be. And there will be other stats that need to be looked at as well, HPs, Sig, and such. But all the equipment will be interchangeable, with-in reason.
I really need to stop thinking........