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Gotcha!
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Ehm… yeah! 
I understand every tiny bit you said, but I doubt I could (at this stage) totally transform that into BP and make it work 
The whole thing is a bit complex than that, I first need to figure out how to make it so it stays hollow and the worker goes to that building… also I should be able to select building if and only if the worker is selected… But this is yet another thing that we need discussion about… Do we want this type of style, ie worker builds an object, or a red alert style, where you click on a building, it goes in queue and after it’s done you just place it in world… I prefer the first method…