I'm still new to the game, but several times now I've designed and tooled for an "improved" version of a ship class only to find that refitting to that class will cost almost as much as, or more than, simple building new ships.   I'd like to be able to take a two-tiered approach, with the maximum improvement on new construction and a more limited, economical upgrade for refits, but. . . :

Is there a way to see what exactly would be the time & cost of a refit from an existing class to one being considered, other than the time and expense of retooling to the new class under consideration?  If not I'd think that would be a neat feature to add, so that people can explore options for modernization (or "service life extension") of existing classes.   And learn about what is and is not an economical refit. .  without committing to a retool just to ask "how about this?"