Arrived in 3 very heavy boxes.  Make sure you have help to move them.  Make sure you read directions first before starting anything.  We laid out all the pieces in the garage, read the directions and started.  We built a wood base per the directions and it worked very well.  We had to call customer service once during the build because the directions were unclear.  Customer service was vey helpful and proceeded.  On the down side I will say we had some issues with the roof and the size of the screws to hold the parts together.  We used the larger screws in some cases.  Also, we had an issue with the roof/door being completely square and had to use shims to make it work.  Shims are included in parts.  Overall very happy and would recommend.  We have had zero leaks or issues since October 2017.