Process: Stretchin' a Canvas

I've been going through subject matter to paint next.  I had narrowed down to a few photos I'd taken over the past few years to use as source material for paintings and I really got stuck on this one photo:

Source photo for painting

It is my younger son a couple years ago on the beach.  After looking at the important elements, the best proportions and composition, I realized it would be best to have a more "horizontal" composition.  This should elongate the horizon and water/shoreline that are prevalent in this photo. 

What I have arrived at is a 20" x 36" canvas.  This had canvas had to be built.  Here is the real basic process:

Tools for the job

Stretcher bars assembled and laid out on canvas roll.  Cut to wrap around the back of the bars for a "Gallery Wrap"

Canvas cut down to size

Starting in the center of each side: pull tight, staple once, move to opposite side repeat... then start adding two staples to each side.  Canvas pliers help in really gripping the canvas to pull taut.

Corners are made like "hospital corner" on a bed