Plot:
So there should be an option to betray them during the build the defence mission, e.g. by letting the Argon One know.
Also the plot should give you the blueprint of the maru to prevent its reverse engineering.
Jonferco should be a independent faction, their HQ would nicely fit in a new OL subsystem with the sub name Devoid clime.
JSDD could be neutral to most commonwealth nations, as they are working on their infrastructure, but have some hostilities to other Corps.
The could also sell a TOA at a shipyard to speed up their placement.
An Agent mission to steal/buy ship blueprints and Missions to buy station blueprints would fit nicely.
I would divide all OOS damage by 4, OOS combat is just too quick in comparison to IS
I would allow the Terran frigates PSP's to the left and right to match those M7 of the commonwealth.
I would reduce the amount of weaponslots of boron fighters and instead increase their shield slots, they are limited by energy so the reduction just transfers this malus to OOS, extra shields on the other hand would fit nicely.
I would switch the side effects of the Ionplasma and the Ionpulse weapons, Ionplasma is designed to kill an enemy as quick as possible reducing speed would really help here, Ion pulse is designed to keep the enemy down this would really benefit from removing weapon energy.
I would allow boarding pods to the Aquillo, as the Scirokos got quite a buff in FL it can stand for itself and doesn't need it's Concurrence nerfed.
I would switch the Models of Euros and Solano a rear turret just fits better to a M4+.
Also the cut Perseus variant paranid_M3_var1_scene could be used, it looks really nice.