This feature looks awesome. And based on your mood you must be really proudof this: 2 dev answered a lot of question beating the responsiveness of many dev dir.
I have one feedback (Personal attitude to Tech system): In any game having to develop 10 times basically the same tech is much worse than every time significantly different one. In your design it has two practical consequence:
More variety in prerequisite would be nice. Interdepndncies between techs, the different components of an infantry division requiring different experiences etc.
More complex effect per technology. More significant feeling that you developedsomething. (It is better to get after a year of suffering 2 levelof attack than 10 times 0.2 level.) Have some 1 time tech in the middle of the war as well.
Summa summarum. This new tech system looks a big step toward the one used in the mod CORE. However the tech part of that mod was worse for spirit with those small steps.