So, I got this mission to build a defense station, I did but as it is, the mission did not progress. So I re-configured the layout (worked already on other stations) and assigned (and paid) a builder to execute the new plan.
But the bastard never showed up!

That was at least two hours ago. I cannot see him anywhere the station or the sector (at the time of order, he was one sector away). I cannot search him, because I do not see his designation in the station building overview. Maybe he got blown up or found another job???
Question: is there a way to deselect the builder and select a new one? I have not found this option anywhere and I would really like to have those 6 mills from the mission

Thanks in advance