Okay, here is my feedback regarding the tech tree files. Most of it is just nitpicking or difference in opinion what ID or Category certain techs should be.
TechTree.xml
- Interstellar Construction: ID is Industry, should be Logistics like all the other hull techs.
- Space Mining I-III: ID is Logistics, should be Industry.
- Hull Strengthening: ID is Weapons, should be Logistics.
- Industrial Starbase Construction: Category is Industry, should be Manufacturing or Starbase (Industry is not a valid Category).
- Advanced Industrial Starbases: ditto.
- Way of the Arnor: Category should be Manufacturing, not Economics.
- Way of the Dread Lord: Category should be Manufacturing, not Military.
- Defensive Meditation: Category should be Military, not Pure Research.
- Offensive Meditation: ditto.
- Healing Pools: ID is Biology, should be Culture like all other entertainment techs.
- Fleet Warp Bubbles I-III: ID should be Propulsion, not Computing (makes more sense that way).
- Scatter Blaster I+II: Should be set to cannot be traded, to keep them in line with Scatter Blaster III.
Altarian_TechTree.xml
- Interstellar Construction: ID is Industry, should be Logistics like all the other hull techs.
- Advanced Hulls: ID is Industry, should be Logistics like all the other hull techs.
- Space Mining I-III: ID is Logistics, should be Industry.
- Healing Pools: ID is Biology, should be Culture like all other entertainment techs.
- Shrine of Tandis: ID is Industry, should be Culture.
Arcean_TechTree.xml
- Interstellar Construction: ID is Industry, should be Logistics like all the other hull techs.
- Advanced Hulls: ID is Industry, should be Logistics like all the other hull techs.
- Space Mining I-III: ID is Logistics, should be Industry.
- Xeno Geology: Category is Economics, should be Manufacturing (or ID and Category Biology).
Drath_TechTree.xml
- Interstellar Construction: ID is Industry, should be Logistics like all the other hull techs.
- Advanced Hulls: ID is Industry, should be Logistics like all the other hull techs.
- Space Mining I-III: ID is Logistics, should be Industry.
- Healing Pools: ID is Biology, should be Culture like all other entertainment techs.
Drengin_TechTree.xml
- Interstellar Construction: ID is Industry, should be Logistics like all the other hull techs.
- Advanced Hulls: ID is Industry, should be Logistics like all the other hull techs.
- Space Mining I-III: ID is Logistics, should be Industry.
- Enhanced Slavelings: Should be set to cannot be stolen.
- Artificial Slavelings: Should be set to cannot be stolen.
- Hull Strengthening: ID is Defenses, should be Logistics.
Iconian_TechTree.xml
- Interstellar Construction: ID is Industry, should be Logistics like all the other hull techs.
- Advanced Hulls: ID is Industry, should be Logistics like all the other hull techs.
- Space Mining I-III: ID is Logistics, should be Industry.
- Organic Hulls: ID is Industry, should be Logistics.
- Self-Healing Hulls: ID is Industry, should be Logistics.
- Expert Engineering: ID is Industry, should be Logistics.
Korath_TechTree.xml
- Interstellar Construction: ID is Industry, should be Logistics like all the other hull techs.
- Advanced Hulls: ID is Industry, should be Logistics like all the other hull techs.
- Space Mining I-III: ID is Logistics, should be Industry.
- Enhanced Slavelings: Should be set to cannot be stolen.
- Artificial Slavelings: Should be set to cannot be stolen.
Korx_TechTree.xml
- Interstellar Construction: ID is Industry, should be Logistics like all the other hull techs.
- Advanced Hulls: ID is Industry, should be Logistics like all the other hull techs.
- Space Mining I-III: ID is Logistics, should be Industry.
- Expert Refining: Category is Economics, should be Starbase.
Krynn_TechTree.xml
- Deeper Knowledge: Category is Pure Research, should be Research.
- Interstellar Construction: ID is Industry, should be Logistics like all the other hull techs.
- Advanced Hulls: ID is Industry, should be Logistics like all the other hull techs.
- Space Mining I-III: ID is Logistics, should be Industry.
- Robust Hulls: ID is Industry and Category is Pure Research, should be Logistics and Hulls.
- Superior Espionage: ID is Industry, should be either Culture or Computing. Also, the description still states, that it increases espionage.
- Master Spies: ID is Industry, should be either Culture.
- Greater Tolerance: Should be set to cannot be stolen.
MinorRace_TechTree.xml
- Interstellar Construction: ID is Industry, should be Logistics like all the other hull techs.
- Advanced Hulls: ID is Industry, should be Logistics like all the other hull techs.
- Space Mining I-III: ID is Logistics, should be Industry.
- Fleet Warp Bubbles I-III: Why do the minors have those?
Terran_TechTree.xml
- Interstellar Construction: ID is Industry, should be Logistics like all the other hull techs.
- Advanced Hulls: ID is Industry, should be Logistics like all the other hull techs.
- Space Mining I-III: ID is Logistics, should be Industry.
- Fleet Warp Bubbles I-III: ID is Computing, should be Propulsion.
Thalan_TechTree.xml
- Interstellar Construction: ID is Industry, should be Logistics like all the other hull techs.
- Advanced Hulls: ID is Industry, should be Logistics like all the other hull techs.
- Space Mining I-III: ID is Logistics, should be Industry.
- Expert Gravity Channeling: ID is Industry and Category is Biology. ID should be either Computing or Propulsion, and Category should be Pure Research. It should also be set to cannot be traded.
- Hyperion Hull Design: ID is Industry, should be Logistics.
- Defense Industries: Should be set to cannot be traded.
Torian_TechTree.xml
- Greater Knowledge: Category is Pure Research, should be Research.
- Interstellar Construction: ID is Industry, should be Logistics like all the other hull techs.
- Advanced Hulls: ID is Industry, should be Logistics like all the other hull techs.
- Space Mining I-III: ID is Logistics, should be Industry.
Yor_TechTree.xml
- Cybernetic Support Systems: Should be set to cannot be stolen.
- Interstellar Construction: ID is Industry, should be Logistics like all the other hull techs.
- Advanced Hulls: ID is Industry, should be Logistics like all the other hull techs.
- Space Mining I-III: ID is Logistics, should be Industry.
So, playing some test games is the only thing left now.