no different than installing a receptacle at that point in my opinion. If you "construct" a 4x4 mount for the receptacle is it then a "structure"? I think not. the pedestals that I have installed contain 4 outlets in and outdoor box with self contained weatherproof covers and circuit breakers with weatherproof covers. I attach this assembly to a6x6 post and loop the feeders thru. never have I ever had an inspector consider this as anything more that a mounted outlet and never had them called a "structure".