Here is the pic of the reef chair, pre-stain. The chair is phenomenally designed and the plans are easy to follow.
The total cost for me was around $40
This took one evening to complete after work. So, maybe 4 hours or so, and this does not include sanding and staining.
As for the cushion, our dimensions measured out to be 30″ wide and 20.5″ deep. We used 4″ foam piece for our cushion and it is extremely comfy.