MINITURIZATION HAS BEEN FIXED!
from
GalCiv2 Forums
Just heard it from Brad on IRC. It might not have made it into 1.3 beta 2, but it will definitely be in beta3/final. From there on out, sizemods are now based on the base hull size, so parts will no longer grow as you research miniturization techs.
I repeat:
Miniturization has been fixed!
I repeat:
Miniturization has been fixed!