Plasma turrets looked like they were available much earlier than they actually were because there was no prerequisite on Blue metal catalyst. This meant that an additional 10~ blue science techs were required.
Blue Metal Catalyst > Sodium Perchlorate > Lithium Perchlorate > Lithium-ion Battery > Plasma Turret 1
Solution:
Make Plasma Turret 1 take Battery rather than Lithium-ion Battery
Make Plasma Turret 2 take Lithium-ion Battery rather than Silver Zinc Battery
Create new tech Chlorine Processing 4
Prerequisites:
Chlorine Processing 3
Advanced Chemistry 3
Sodium Processing
Recipe Unlocks:
Sodium Chlorate
Sodium Perchlorate
Perchloric Acid
Tech Unlocks:
Rocket Booster 2
Lithium Processing
Science Packs:
Red
Green
Blue
Make Plasma Turret 1 take Cobalt Steel Plate rather than Invar Plate (so it isn't available too early in Blue Science)
Make Plasma Turret 2 take Titanium Plate rather than Cobalt Steel Plate
Make Plasma Turrets 1 tech depend on Advanced Cobalt Steel Smelting 1
Plasma turrets looked like they were available much earlier than they actually were because there was no prerequisite on Blue metal catalyst. This meant that an additional 10~ blue science techs were required.
Blue Metal Catalyst > Sodium Perchlorate > Lithium Perchlorate > Lithium-ion Battery > Plasma Turret 1
Solution: