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If the sharp edges are bad. Then after a front bubble, could you simply take pvc pipe and slit down the length and glue that over the long side sharp edges to round them?
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A single slit would produce a raising, 3/4-round edge. Two slits and butting the halves would produce a half-round. Then it's down to the 4%-of-gross-width rule, generally ~4".
ksa8907 — Closing the gap is non-trivial.