The huge amounts of resources which can be stockpiled before the war, particularly oil, is not very realistic. Fuel consumption was very high during peace time also. So, without any knowledge of what is moddable or not, I propose a "oil" cost for IC. Perhaps 1/2 oil per IC, or maybe even 1/4. During war time, the oil requirements for IC (and civilian uses) could be halved again. It would be necessary to increase oil production to allow for much of the added consumption.
Oil would become much more important under these circumstances-no oil, no industry. One would have to balance military requirements with the industrial requirements. Last but not least, there would be no oceans of oil stocks built up prior to the main war.
Again, I have no idea if this is even possible, or how much work it would be.
BTW, how is the current update coming along?