[Andrés]

That's what I suggested order them by tech and give big early ships some dissadvantage such as more life support/crew quartes more engines-per-move than other ships their size, to-hit penalties , ect. and go the other way giving some advantage to small high tech ships.
The sovereign can still be smaller than the galaxy but have advantages to make it better, or even have more usable space inside by using less crewq/lifesup.