If the mod is still being developed, I have a suggestion.
Can we build SACU presets on the fly?
How this would work:
Where the presets are, replace them with the upgrades so all (left, back, right) are all visible simultaneously, next to one another.
Select up to one upgrade option from each category. Like buttons, they get greyed out when selected.
Once you have selected your desired upgrades, click the icon to build the basic SACU, the one that usually would build an SACU without upgrades.
It will add to the build queue a SACU with your selected upgrades. Left clicking the in-progress build icon in the build tray will add duplicates of the same configuration SACU. Right clicking to remove, like with normal factory ques.
Each different configuration added to the build queue will have its own icon, which can also be enumerated up or down as desired.