We should have a worker’s list that telling us where are our worker :
If on a tower, how many time left and a target button for that tower (so we know that we need to defend it until it’s done).
If tower finished, a target tower button to direct us to that tower in order to deploy it.
If he is free, just put a free image something like that , it will be us to manualy assign a new tower to a member.
Because at the end of the conquest, the map is so messy that we need time to find where they are etc…
Btw, we should have notification when Research or Tower are completed please !