Having the side stretchers mounted between the front and back stretchers is an elegang solution I had not noticed until now. A neat way to make the (almost architectural looking) leg/arm elements stand out. 
I always fint that fitting parts like that is a bit stessfull. It needs to fint perfectly, and also it is rather thin parts that has to carry a lot of load. Good work!

"The good chair is a task one is never completely done with" Hans Wegner