I had some leftover wood from building my daughters loft bed and after coming across this plan realized i had all the right lumber on had already so after a trip to the store to buy a few bolts i was ready to build. I built one chair following Ana's plans exactly, using 1x2's for the outside frames, the chair turned out awesome and I wanted another. For the second one, i didn't have enough 1x2's left so I used 2x2s for the outside frame. I kept the inside width (24") of the back frame the same and adjusted the rest of the dimensions to fit. While the 1x2 chair was great and very sturdy, the 2x2 chair is rock solid. I rounded all the edges of the boards with a 1/4" roundover bit and spray painted everything dark chocolate brown. The fabric slings are made of cotton duck cloth. I added a 1" foam pillow sewn onto the top of the sling because my head rests right on the top boards and I wanted a little padding.
All said, including wood, hardware, fabric and the foam for the pillow I think this chair cost about $40 to build and finish.
As my 3 daughters piled on my lap to read on night the 2x2 chair has been load tested to about 300 lbs!