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You've got the right idea. One thing to consider: to use cauls in 5 places, you need 10 cauls. They are positioned directly over each other, one on top of the surface and one below, with their taped edges facing each other.
Think of a floor joist, for example. It's strength is greater across the grain (standing on edge) than it is on flat. So if you want to use it to brace something flat & true, you have to stand it on edge. So 1 caul on edge above and 1 caul on edge below clamped together will (hopefully) provide you with a flat, straight, level surface.
Think of a floor joist, for example. It's strength is greater across the grain (standing on edge) than it is on flat. So if you want to use it to brace something flat & true, you have to stand it on edge. So 1 caul on edge above and 1 caul on edge below clamped together will (hopefully) provide you with a flat, straight, level surface.