i realy like the idea and i think it was applied vary well.
if you are making a new adition i would like to see in an easier way the supply (how much total resorces,how much resorces avalble...) and to be able to take resorces from one postion to another instad of ordering some resorces to a postion and hoping it will come from the right place.
and if you can give a larger vareity of building (chep postion,expansive postions,long rang.short range...)