The attic will hit R80. Brazelton is doing much of the traditional renovation work himself, with the help of his father and a few friends. He sleeps inside the unheated, unfinished house on a cot, sometimes with the family's two dogs for companions. The more complicated work is being handled by a professional builder, Ryan Stegora.
Go with an aluminum patch. Use aluminum rivits or screws. Avoid stainless or other metal screws due to the interaction of different metals. Use a sealant like 3m 5200 or Boatlife. Do not use fiberglass to patch aluminum. It just doesn't hold up well.
Fiberglass shingles are not fragile, but they must be nailed more carefully than traditional shingles. There is some risk that the fiberglass core will be broken if it is not nailed properly, and this can reduce the efficacy of the shingle and result in necessary maintenance down the line.