Thanks folks, I am getting the picture now of what I need to do, where I need to start and so on.
I think the idea of changing what I can in the Blueprints first is a very good idea. Of course, as I add other parts of the mod and need to rebalance the whole, I will have to go back to the blueprints and re-visit those changes as well. But at least I will know the blueprints well by then. I will have to make sure I keep a changes master document or spreadsheet where I log every change I make in every blueprint.
Quick question: Say I make T2 mexes produce 4 mps not 6 mps. Is there one master mex blueprint I can do this on so it flows to the four factions or do I have to change each of the factions' mex blueprints?