TL;DR
add a table/graph of resources-amount on map in map previewWhat ?
add a table/graph which shows the resources amount for the current map in preview.differentiation in startarea / mid area / shown preview / infinite
Why ?
its more clearly for the player and espially the modder if a wanted resource base is provided by the map generation.So no one needs to check and count if all and enough (or low enough) resources are available
May be this methode could also applied to the map terrain