lowering the top would require cutting the frames as you plan the effect od lowering the top the canvas will still be the same length the canvas is made to fit the frame at the curve now lowering will make the end at the side incorrect and lose. maybe not that important to you . once you cut and lower you could pull the canvas tight a mark where the seam needs to be taking in to make the canvas evenly tight
where the center bow has straps that support it and not a pocket as some they can just be adjusted to fit
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