A lot of these can be concurrent:

LANCER
- HE Mini Rockets
- HE Mini Rockets Mk2
* Lancer
* Lancer bunker
* Lancer hardpoint

BODIES 1
- Composite Alloys
- Bug
- Composite Alloys Mk2
* Scorpion
- Python
- Fuel Injection Engine Mk3
* Hover

HEAVY CANNON
- Cannon damage
- Medium cannon
- Cannon damage Mk2
- Cannon damage Mk3
* Heavy cannon (req Python)
- Medium Cannon hardpoint
* Heavy cannon hardpoint

AA 1
- Hurricane damage Mk1
- Hurricane damage Mk2
- Cyclone
* Cyclone emplacement

RESEARCH RUSH
- Synaptic Link Data Analysis
- Synaptic Link Data Analysis Mk2
- Synaptic Link Data Analysis Mk3
- Dedicated Synaptic Link Data Analysis
- Dedicated Synaptic Link Data Analysis Mk2
- Improved Engineering
- Sensor upgrade
- Dedicated Synaptic Link Data Analysis Mk3
- Neural Synapse Research Brain
- Neural Synapse Research Brain Mk2
- Sensor upgrade
- Advanced Engineering
* Heavy repair turret
* Auto-repair

LASER (and AA 2)
- Neural Synapse Research Brain Mk3
- Flashlight (req Sensor upgrade x2)
* Pulse laser
- laser damage Mk1-3, laser speed Mk1-3, laser accuracy
* Pulse laser emplacement
- Stormbringer
* Stormbringer emplacement

UBER SENSOR
- Automated Factory Production
- VTOL (req hover)
- VTOL Factory
- VTOL rearming pad
= VTOL strike tower
- HE Mortar shells
- HE Mortar shells Mk2
- HE Mortar shells Mk3
= CB tower (req ~DSLDA Mk2)
= VTOL CB tower
- Wide spectrum sensor (prereq sensor upg and ~NSRB Mk1)
* Wide spectrum sensor tower
* Satellite uplink sensor (req ~NSRB Mk2)

BODIES 2
- Composite Alloys Mk3
- Dense composite alloys
- Dense composite alloys Mk2
* Mantis
- Dense composite alloys Mk3
- Superdense composite alloys
* Retaliation
- Superdense composite alloys Mk2
- Leopard
- Panther
* Retribution
- Superdense composite alloys Mk3
- Tiger
* Vengeance

SCOURGE
- [Lancer] HEAT Rocket warhead Mk1-3
- [Lancer] HESH Rocket warhead Mk1-~2
- Tank Killer
* Scourge (req NSRB Mk2)
* Scourge hardpoint
* Scourge tower
- scourge damage Mk1-3, etc

GAUSS
- HE cannon shells Mk1-3
- APFSDS cannon Mk1-3
- HAPFSDS cannon Mk1
- cannon speed Mk1-~2
- HPV cannon (req DSLDA ~Mk2)
- Needle gun (req NSRB Mk2)
- rail damage Mk1
- rail damage Mk2
- Rail gun
- rail damage Mk3
* Gauss cannon
* Gauss hardpoint
- rail accuracy
- rail speed Mk1-3
* Gauss emplacement

FORTRESSES
- Hardcrete Mk3 (req Hardcrete Mk2)
- Supercrete Mk1-3
- Plascrete Mk1-3
- Plassteel Mk1
* Mass Driver Fortress (req Gauss)