Just a suggestion to add more information to an overview map.
A list that shows you how many of each building you got. (easier to see the whole production chain) and maybe a CAP number on that list aswell. like how many buildings of that type can you still build(this part more directed at the mines that are built + how many available)
A stat in the mayor house over each rescource that shows. how many in and how many out?.
my 2 cents at the moment. have a nice day