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Michele,
For any who don't know, I was in Bill Whitaker's workshop with Michele.
I was overly obsessive compulsive about it, and used thin luan plywood on the short ends (as you have diagrammed), nothing on the long ends. I used 2 small screws per canvas on each end to hold the wet faces apart (wet faces inward towards each other). I then cut two pieces of the thin light luan the same size as the canvas dimensions, and placed it over and under like a box to protect against puncture. I held this portion together with duct tape.
Even though my luggage was damaged some (abrasion marks and a small hole) in transport, the canvases got through fine inside with other hard- edged equipment, with no problems at all. I can't say the same for the small mixing glass I had wrapped in cloth in the center of the suitcase. They handled it so roughly that that broke.
In case anyone's interested I flew home with my paint tubes in my checked luggage (taped together in a plastic bag) and all came through fine. I did not fly with any flammables like turps though, those I just left behind.
Carl
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