A side note: Lee made a slight error in the combat tree:

Combat
Tier 1
- Orbital Defenses: Only allows the construction of Energy Array platforms.

- Offensive Initiative: No longer grants the ability to build Cruisers or bonuses to cruisers / battleships.

Tier 2
- Advanced Orbital Defenses: Allows the construction of Missile defense platforms. +2% reduction orbital build time per rank +2% dmg increase time per rank (replaces mine emplacement.)
(note: These two changes go along with the change that that Energy Platforms be strong against light units and Missile Platforms are strong against capital class ships).

He had them backwards. (I have corrected it in his post.)