Need design Creations help

[Emperor's Child]

Is there a way to force the design-creations ships to build an EXACT weapons mix for a given hull size? The mod I'm working on is intended to be played with all weapon technology available, but with artifical limits on "standardized" ship designs that all must use. My plan is to define each ship in the design creations section, but the problem is that it looks like you can't define the percentages in the primary and secondary weapons mix, nor does it allow you to define more than a "primary" or "secondary" batch of weapons. I have 9 basic weapons that are in combindation of up to 4 on any particular ship that I'd like to ensure are the same every time they are made. I'm not sure how to get the AI's Design creations file to do this. Can this be done?

Is there a way to pre-load the standard designs into the AI file and guarantee they will not be changed during game play?