I bought this gazebo in July. It took a while for me to receive it. I had a concrete slab poured in advance. After reading the instruction and inspecting the parts, I realized that the project requires high accuracy. I am a female engineer who regards herself the one of the best technicians. I decided not to hire any handyman in fear of lower quality. It took me 2 days to align the 8 poles on the concrete surface. I based my measurement on the metal thresholds. Unfortunately, the metal thresholds are slightly warped, and drilling on concrete slab added more error. After putting everything together, the diameter was 0.5" shorter. This caused huge difficulty to the last step: fitting the top cap to the rafts. The cap couldn't fit snugly, so I had to attach a wood stick in the center as an axle, fasten the lower end of the axle to the center of the ceiling, so that the cap won't be blown away. I am 5'3", to set the roof rafts at 10' fall, I need some support in the center. I created a 8 feet stand by attaching old lamp bases to the ends of a long curtain rod; then I sit the stand on a one foot tall platform piled by bricks, fasten both ends of the rod to the surrounding poles with ropes, so that the stand can stay upright with the rafts lay on it. It took me 4 full weekends to finish the whole project. Regardless the errors and work around, the structure looks wonderful. Considering the whole month during a rain season before the project is completed, I felt extremely lucky that I ordered a vinyl gazebo instead of wood: it is lighter because it's hollow, you don't need to rush because it doesn't need to be sealed, and getting wet doesn't make it any heavier. Anyway, I like the simple but beautiful design, and think it is a very good diy project. It would give it a 5 star if the manufacturer can provide an accurate floor pattern made by stiff boards for the ease of working on concrete slab.