No shortcuts!
Kimber, I would steer away from trying shortcuts because chances are they won't work. You need to take the canvas completely off the stretchers, and add extra support bars in the back. I usually add one in the center of the long side, but your sides are equal.
Does anyone have a suggestion for this? Should she use 45 degree angles?
The sooner you remove the canvas the better because once you apply gesso the edges don't ever quite flatten out.
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