Not sure what category to put this in so please correct me.
Any how as said in the title I would like to know how too put an outline around a part.
Now I could use a SelectionBox, but what if I have a union and I want to put an outline around that, If I just used a SelectionBox it would look like this:
I see that you are combining separate parts away from each other, making it 1 union, so the only way to put an outline around all these specific parts is to make specific unions or parts from them.