Hi,
I once made an Excel sheet for SM:P star ship creation (which is similiar to SM2 I think). And it was a nightmare, as there are so many interdependencies with space, mass and energy.
So please come up with a different system.
What I do now, and this works very well, is simply to decide as a GM hoiw a ship is designed, using some basic guidelines as "if it is smaller than this, it is a corvette and can have up to so many weapon systems,...". This is not quite as "accurate", but saves a lot of time.
BR
Juegren