As an update on this topic, I was able to order stretcher bar in 12 foot lengths, cut to 6 foot for shipping purposes, from Breathing Color. This really cuts costs but the tradeoff is I have to do more labor.
The PitBull pliers are still back ordered, I'll get a $40.00 pair of pliers and see how they work.
I have a 12x22 inch canvas print in hand waiting for the lumber.
I also found a guy with canvas experience who is going to show me how to finish the corners.