I’ve looked on the forum but I couldn’t find this discussed anywhere. If it is, just link me and ignore this thread. 
Anyways, I have a func_const with start_built selected, however the building materails are still visible and at this point and I’d like to make them invisible till someone blows up the func_const. Am I missing something or do they have to be there? Thanks!
This is for isle, after a few full servers on the beta the other night… expect the final to be out shortly. 
It can sometimes not behave the way it should. Always make the construct command last in the spawn function. (Move the contruction type higer up) Also try this on a very simple construction first.