Love it so much,  I purchased another unit. What I have seen reviewed mostly relates to the roofing panels. Although I assembled this unit solo,  a second body would have made a huge difference installing the roofing. The trick is to square the lower assembly first,  and leave the roofing support beams bolts 1-2 turns loose at both ends. Tighten only after all panels are installed. 
Each panel is three sections held together using M4 bolts and nuts. I found that,  in some areas,  the bolts would not clear the slot width and required more than a little encouraging to get them into place, but typically only on one edge. I had to slide the panel up from the bottom of the rail in one or two cases and then set the other edge into place. I hope that info is helpful. Regardless,  I am happy with the result.