You mean the launcher is sort of a silo, and the more of these you link together the bigger your missile can be? And its effects are determined by the ratio of different missile parts?
I think it's a cool idea, but I don't think it's suitable for vanilla (because it doesn't really add a new mechanic, and also, would be very hard to balance, though that is of secondary importance), and it's currently impossible to mod (I think, though I could be wrong about that). I would enjoy a modded weapon like this though, if it ever becomes possible.