Sounds like a good project with a good outcome. Were you able to seal the new wood against water? Bag seals don't leak freely, but the canvas, with its many staple holes and unsealed folds, can pass small amounts of water. Then the foam, especially if an open-cell foam is used, can absorb that water and hold it against the wood. Poplar is strong, but unless sealed, poplar is susceptible to damp rot.
Bill
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