Built a client a bike shelter. They were surprised by the simple design, but found it to be quite workable. The structure is very light so doesn't put any strain on the fence that I could see. I used 2 x 3's. Borrowed the idea from DIY friends. I did the same thing at home so had a picture to show client already, but this one is bigger since there's more space between gate and fence. They have four bikes to fit here so should be enough room.