So, I really appreciate how this mod makes secret-tech structures feel more meaningful.
The ability to construct faction units makes the dream of a fleet of networked units a viable win-condition instead of a win-more.

However, I perceive the immediate access to tier 3-4 units to be a much sharper power spike than the opportunity cost. To be fair, I have never found rushing those tier 4 units to be the optimal play, but certainly tier 2-3s.

Perhaps requiring an elite training center to produce the tier 4s + the early barracks for tier 3s would help make access to those units feel powerful, while maintaining the game's general gating structure.