Let me say that I’ve not really tested this in all weathers yet but I was impressed by the quality of build materials and the utube video of the construction was really helpful. Didn’t use the paper version at all. Went together easily and holes aligned well. You do need a fair bit of equipment for example an electric drill with socket set adaptor and sockets. I really think the drill is needed- it would be very tough to do it with a manual socket wrench as you use self-tapping screws that need to penetrate hard resin. 
But the construction was easy. Easier with two people but just about manageable with one. 
I’m very happy with it.