Just finished putting one of these sheds together. I build a 2X6 wooden foundation with floor joists 16" on center. I used 3/4" plywood for the floor and all the wood was pressure treated. I built the foundation the size that was given in the instructions and it turned out ok. Wish I would have made it a couple of inches bigger all around as where the panels overlap there is a big opening and you can see the ground. Critters can get in. The sheet metal is pretty flimsy but that is to be expected as they are all this way. I was unable to get the shed moved around per the instructions so all the screws would line up. I ended up having a buckle in the front and rear gables. I also had to drill some of the holes at the edge of the roof as the holes just would not line up. In the kit they supply you with these small plastic corners for the roof. I have yet to figure out how they go on. After the foundation was completed it took my wife and me 10 straight hours on a Saturday and then 1 1/2 weeks every night after work for 3 hours. Still don't have the ground anchors installed. The instructions need to be revised or at least throw an addendum in the box as some of the prices you're given to use for the roll-up garage door are not in the instructions. I was short some nuts, bolts, and washers for the roll-up door so I had to go out and buy them. Less than $10. The plastic washers do not seal the water out so I had to silicone all the screws. Probably would not buy this shed if I had to do it over again. Too costly for the quality you get.
Not to bad to put together
ConsAlignment for screws are off
Plastic washers do not seal out water
Very flemsy and easy to dent
Time consuming to build