Most people find the 2 SS engines not worth it. I guess it's part of the strategy, you get to do both IF you beeline the certain tech FIRST....
Anyhow, it seems weight does not factor in the flight times, which is another part of strategy gone. Technically, adding in each SS casing should slow it down... I'd also like to see, different types of cock-pits, etc. Some lighter than others, but at a much higher cost. It is YOUR strategy to chose which path to follow. For some reason you can change the cockpit and other component's COLOR, but that's about it. I guess they were hoping to get more deeper than that, but wanted to just kick the game on the shelf sooner, and throw in the extra stuff in a future expansion.