I am hoping that with "Money" you will be able to buy tanks and airplanes from your allies. This would be good for the smaller nations, so that they can focus on industry and troops. Thats how it really was, and thats how it is now. Nations buy tanks, they don't make them.
Like the fact that Spain, Denmarck, Sweden, Canada, Greece, and Germany all use German Leopard series tanks. It should be a diplomatic tool to allow nations to build things under license (basically allow them to make things that they don't know how to make already) But it should be expensive since they would have to build the factories, machines, and train people to make them.
I am sure that it is already to late to put that in the game, but maybe it could make it into a patch (fingers crossed)