While I understand your preference for longer build times, and am not necessarily opposed to the idea, I believe it to be a mistake on your part to force that on the player. Not everyone has the amount of time to devote to the game that would be required in that case and your choice will drive potential players away, which is a shame given the amount of effort you have put into it and the otherwise excellent mod you have created.
As I said, if you offered both increased and normal build times as separate files and let the players choose which to install your mod would be much more widely used and appreciated. Who knows, you might even get paid to do something similar someday ...
Historical examples of militaries suffering a decline in quality due to the early loss of most of their experienced personnel abound; the British Army in WWI, the Japanese Naval Air Arm in WWII, and the French Army in the Napoleonic wars come to mind. With longer unit build times and consequently lower replacement rates the AI will have to drastically increase its unit production to compensate, or drastically slow down the pace of combat, assuming that's possible, or see its military decimated in short order. An interesting dilemma.
An I WIN mod; I like that.
Good for the occasions when I totally muck things up and am getting my butt kicked.