I don't have the time to read it all but I have read enough to chime in I believe.

What about leakage?

What about plant usage?

Yes burning a blue flame will produce CO² but how would you regulate the exchange of gas vs. heat?

You math looks like it assumes everything is perfect and in a sealed environment. If you can produce CO² at that level and you may I did not bother to recheck your math I assumed it was right. You may have just left off a few variables. The idea of using enhanced CO² is to raise the level to (X) I prefer to add 1500ppm to raise the level to 1800ppm then hold it there for 4-6 hours only refilling it when the level drops more then 100ppm. Exchange the air once every 6 hours and start all over again.

I also assume you know that for growing indoors you must have HID lights so the plant can process the extra amount of CO²?

Fluorescents lights do not produce enough light for the plant to process the extra amount of CO²