I bought this shed from a large retailer and put it together with my wife over a weekend. The instructions were fantastic and I recommend you follow them exactly as it will lead to exactly what you want. The engineering and packaging of the screws and other accessories is very clever. 
It will be interesting to see how it holds up in the Australian heat where we can get days and days of 43 degrees centigrade (or 110 Fahrenheit in USA) but I imagine it will be fine! Make sure your base is perfect, if not it will cause you issues!