This was my 2nd wood working project. I found it was nice to have a 2nd set of hands to line up the top boards and put on the hinges. I did use a piano hinge for the back like another poster mentioned. It is smaller (not as thick) and helps keep the boards all even on the end when the back is lowered.
I really like the look of this lounger. I was worried that the boards on the edges would need more support, but they seem sturdy enough. If I notice them sagging later or starting to move, I will put some braces underneath.